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Oracle® Database PL/SQL Packages and Types Reference
10g Release 2 (10.2)

Part Number B14258-01
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12 DBMS_ADVISOR

DBMS_ADVISOR is part of the Server Manageability suite of Advisors, a set of expert systems that identifies and helps resolve performance problems relating to the various database server components.

See Also:

This chapter contains the following topics:


Using DBMS_ADVISOR

This section contains topics which relate to using the DBMS_ADVISOR package.


Security Model

Security on this package can be controlled by granting EXECUTE on this package to selected users or roles. You might want to write a cover package on top of this one that restricts the alert names used. EXECUTE privilege on this cover package can then be granted rather than on this package. In addition, there is an ADVISOR privilege, which is required by DBMS_ADVISOR procedures.


Summary of DBMS_ADVISOR Subprograms

Table 12-1 DBMS_ADVISOR Package Subprograms

Subprogram Description Used in
ADD_SQLWKLD_REF Procedure
Adds a workload reference to an Advisor task SQL Access Advisor only
ADD_SQLWKLD_STATEMENT Procedure
Adds a single statement to a workload SQL Access Advisor only
CANCEL_TASK Procedure
Cancels a currently executing task operation All Advisors
CREATE_FILE Procedure
Creates an external file from a PL/SQL CLOB variable, which is useful for creating scripts and reports All Advisors
CREATE_OBJECT Procedure
Creates a new task object All Advisors
CREATE_SQLWKLD Procedure
Creates a new workload object SQL Access Advisor only
CREATE_TASK Procedures
Creates a new Advisor task in the repository All Advisors
DELETE_SQLWKLD Procedure
Deletes an entire workload object SQL Access Advisor only
DELETE_SQLWKLD_REF Procedure
Deletes an entire workload object SQL Access Advisor only
DELETE_SQLWKLD_STATEMENT Procedure
Deletes one or more statements from a workload SQL Access Advisor only
DELETE_TASK Procedure
Deletes the specified task from the repository All Advisors
EXECUTE_TASK Procedure
Executes the specified task All Advisors
GET_REC_ATTRIBUTES Procedure
Retrieves specific recommendation attributes from a task All Advisors
GET_TASK_REPORT Function
Creates and returns a report for the specified task All Advisors
GET_TASK_SCRIPT Function
Creates and returns an executable SQL script of the Advisor task's recommendations in a buffer All Advisors
IMPLEMENT_TASK Procedure
Implements the tuning recommendations for a task All Advisors
IMPORT_SQLWKLD_SCHEMA Procedure
Imports data into a workload from the current SQL cache SQL Access Advisor only
IMPORT_SQLWKLD_SQLCACHE Procedure
Imports data into a workload from the current SQL cache SQL Access Advisor only
IMPORT_SQLWKLD_STS Procedure
Imports data into a workload from a SQL Tuning Set into a SQL workload data object SQL Access Advisor only
IMPORT_SQLWKLD_SUMADV Procedure
Imports data into a workload from the current SQL cache SQL Access Advisor only
IMPORT_SQLWKLD_USER Procedure
Imports data into a workload from the current SQL cache SQL Access Advisor only
INTERRUPT_TASK Procedure
Stops a currently executing task, ending its operations as it would at a normal exit, so that the recommendations are visible All Advisors
MARK_RECOMMENDATION Procedure
Sets the annotation_status for a particular recommendation All Advisors
QUICK_TUNE Procedure
Performs an analysis on a single SQL statement All Advisors
RESET_TASK Procedure
Resets a task to its initial state All Advisors
SET_DEFAULT_SQLWKLD_PARAMETER Procedure
Imports data into a workload from schema evidence SQL Access Advisor only
SET_DEFAULT_TASK_PARAMETER Procedures
Modifies a default task parameter All Advisors
SET_SQLWKLD_PARAMETER Procedure
Sets the value of a workload parameter SQL Access Advisor only
SET_TASK_PARAMETER Procedure
Sets the specified task parameter value All Advisors
TUNE_MVIEW Procedure
Shows how to decompose a materialized view into two or more materialized views or to restate the materialized view in a way that is more advantageous for fast refresh and query rewrite SQL Access Advisor only
UPDATE_OBJECT Procedure
Updates a task object All Advisors
UPDATE_REC_ATTRIBUTES Procedure
Updates an existing recommendation for the specified task All Advisors
UPDATE_SQLWKLD_ATTRIBUTES Procedure
Updates a workload object SQL Access Advisor only
UPDATE_SQLWKLD_STATEMENT Procedure
Updates one or more SQL statements in a workload SQL Access Advisor only
UPDATE_TASK_ATTRIBUTES Procedure
Updates a task's attributes All Advisors


ADD_SQLWKLD_REF Procedure

This procedure establishes a link between the current SQL Access Advisor task and a SQL Workload object. The link allows an advisor task to access interesting data for doing an analysis. The link also provides a stable view of the data. Once a connection between a SQL Access Advisor task and a SQL Workload object is made, the workload is protected from removal or modification.

Syntax

DBMS_ADVISOR.ADD_SQLWKLD_REF (
   task_name              IN VARCHAR2,
   workload_name          IN VARCHAR2);

Parameters

Table 12-2 ADD_SQLWKLD_REF Procedure Parameters

Parameter Description
task_name The SQL Access task name that uniquely identifies an existing task.
workload_name The name of the workload object to be linked. Once a object has been linked to a task, it becomes read-only and cannot be deleted. There is no limit to the number of links to workload objects. To remove the link to the workload object, use the procedure DELETE_REFERENCE.

Examples

DECLARE
  task_id NUMBER;
  task_name VARCHAR2(30);
  workload_name VARCHAR2(30);
BEGIN
  task_name := 'My Task';
  workload_name := 'My Workload';

  DBMS_ADVISOR.CREATE_TASK(DBMS_ADVISOR.SQLACCESS_ADVISOR, task_id, task_name);
  DBMS_ADVISOR.CREATE_SQLWKLD(workload_name, 'My Workload');
  DBMS_ADVISOR.ADD_SQLWKLD_REF(task_name, workload_name);
END;
/

ADD_SQLWKLD_STATEMENT Procedure

This procedure adds a single statement to the specified workload.

Syntax

DBMS_ADVISOR.ADD_SQLWKLD_STATEMENT (
   workload_name          IN VARCHAR2,
   module                 IN VARCHAR2,
   action                 IN VARCHAR2,
   cpu_time               IN NUMBER := 0,
   elapsed_time           IN NUMBER := 0,
   disk_reads             IN NUMBER := 0,
   buffer_gets            IN NUMBER := 0,
   rows_processed         IN NUMBER := 0,
   optimizer_cost         IN NUMBER := 0,
   executions             IN NUMBER := 1,
   priority               IN NUMBER := 2,
   last_execution_date    IN DATE := 'SYSDATE',
   stat_period            IN NUMBER := 0,
   username               IN VARCHAR2,
   sql_text               IN CLOB);

Parameters

Table 12-3 ADD_SQLWKLD_STATEMENT Procedure Parameters 

Parameter Description
workload_name The workload name that uniquely identifies an existing workload.
module An optional business application module that will be associated with the SQL statement.
action An optional application action that will be associated with the SQL statement.
cpu_time The total CPU time in seconds that is consumed by the SQL statement.
elapsed_time The total elapsed time in seconds that is consumed by the SQL statement.
disk_reads The total disk-read operations that are consumed by the SQL statement.
buffer_gets The total buffer-get operations that are consumed by the SQL statement.
rows_processed The average number of rows processed by the SQL statement.
optimizer_cost The optimizer's calculated cost value.
executions The total execution count by the SQL statement. This value should be greater than zero.
priority The relative priority of the SQL statement. The value must be one of the following: 1-HIGH, 2-MEDIUM, or 3-LOW.
last_execution_date The date and time at which the SQL statement last executed. If the value is NULL, then the current date and time will be used.
stat_period Time interval in seconds from which statement statistics were calculated.
username The Oracle user name that executed the SQL statement. Because a username is an Oracle identifier, the username value must be entered exactly as it is stored in the server. For example, if the user SCOTT is the executing user, then you must provide the user identifier SCOTT in all uppercase letters. It will not recognize the user scott as a match for SCOTT.
sql_text The complete SQL statement. To increase the quality of a recommendation, the SQL statement should not contain bind variables.

Usage Notes

A workload cannot be modified or deleted if it is currently referenced by an active task. A task is considered active if it is not in its initial state. See "RESET_TASK Procedure" for directions on setting a task to its initial state.

The ADD_SQLWKLD_STATEMENT procedure accepts several parameters that may be ignored by the caller. cpu_time, elapsed_time, disk_reads, buffer_gets, and optimizer_cost are only used to sort workload data when actual analysis occurs, so actual values are only necessary when the order_list task parameter references a particular statistic.To determine what statistics to provide when adding a new SQL statement to a workload, examine or set the task parameter order_list. The order_list parameter accepts any combination of the keys: buffer_gets, optimizer_cost, cpu_time, disk_reads, elapsed_time, executions, and priority. A typical setting of priority, optimizer_cost would indicate the SQL Access Advisor will sort the workload data by priority and optimizer_cost and process the highest cost statements first. Any statements added to the workload would need to include appropriate priority and optimizer_cost values. All other statistics can be defaulted or set to zero.For the statistical keys referenced by the order_list task parameter, the actual parameter values should be reasonably accurate since they will be compared to other statements in the workload. If the caller is unable to estimate values, choose values that would determine its importance relative to other statements in the workload. For example, if the current statement is considered the most critical query in your business, then an appropriate value would be anything greater than all other values for the same statistic found in the workload.

Examples

DECLARE
  workload_name VARCHAR2(30);
BEGIN
  workload_name := 'My Workload';

  DBMS_ADVISOR.CREATE_SQLWKLD(workload_name, 'My Workload');
  DBMS_ADVISOR.ADD_SQLWKLD_STATEMENT(workload_name, 'MONTHLY', 'ROLLUP',
                                     100,400,5041,103,640445,680000,2,
                                     1,SYSDATE,1,'SH','SELECT AVG(amount_sold) FROM sh.sales');
END;
/

CANCEL_TASK Procedure

This procedure causes a currently executing operation to terminate. This call does a soft interrupt. It will not break into a low-level database access call like a hard interrupt such as Ctrl-C. The SQL Access Advisor periodically checks for soft interrupts and acts appropriately. As a result, this operation may take a few seconds to respond to a call.

Syntax

DBMS_ADVISOR.CANCEL_TASK (
   task_name      IN  VARCHAR2);

Parameters

Table 12-4 CANCEL_TASK Procedure Parameter

Parameter Description
task_name A valid Advisor task name that uniquely identifies an existing task.

Usage Notes

A cancel command effective restores the task to its condition prior to the start of the cancelled operation. Therefore, a cancelled task or data object cannot be resumed.

Because all Advisor task procedures are synchronous, to cancel an operation, you must use a separate database session.

Examples

DECLARE
  task_id NUMBER;
  task_name VARCHAR2(30);
  workload_name VARCHAR2(30);
BEGIN
  task_name := 'My Task';
  workload_name := 'My Workload';

  DBMS_ADVISOR.CREATE_TASK(DBMS_ADVISOR.SQLACCESS_ADVISOR, task_id, task_name);
  DBMS_ADVISOR.CANCEL_TASK('My Task');
END;
/

CREATE_FILE Procedure

This procedure creates an external file from a PL/SQL CLOB variable, which is used for creating scripts and reports. CREATE_FILE accepts a CLOB input parameter and writes the character string contents to the specified file.

Syntax

DBMS_ADVISOR.CREATE_FILE (
   buffer       IN  CLOB,
   location     IN  VARCHAR2,
   filename     IN  VARCHAR2);

Parameters

Table 12-5 CREATE_FILE Procedure Parameters

Parameter Description
buffer A CLOB buffer containing report or script information.
location Specifies the directory that will contain the new file. You must use the directory alias as defined by the CREATE DIRECTORY statement. The Advisor will translate the alias into the actual directory location.
filename Specifies the output file to receive the script commands. The filename can only contain the name and an optional file type of the form filename.filetype.

Usage Notes

All formatting must be embedded within the CLOB.

The Oracle server restricts file access within Oracle Stored Procedures. This means that file locations and names must adhere to the known file permissions in the server.

Examples

CREATE DIRECTORY MY_DIR as '/homedir/user4/gssmith';
GRANT READ,WRITE ON DIRECTORY MY_DIR TO PUBLIC;

DECLARE
  task_id NUMBER;
  task_name VARCHAR2(30);
  workload_name VARCHAR2(30);
BEGIN
  task_name := 'My Task';
  workload_name := 'My Workload';

  DBMS_ADVISOR.CREATE_TASK(DBMS_ADVISOR.SQLACCESS_ADVISOR, task_id, task_name);
  DBMS_ADVISOR.CREATE_SQLWKLD(workload_name, 'My Workload');
  DBMS_ADVISOR.ADD_SQLWKLD_REF(task_name, workload_name);
  DBMS_ADVISOR.ADD_SQLWKLD_STATEMENT(workload_name, 'MONTHLY', 'ROLLUP',
                                     100,400,5041,103,640445,680000,2,
                                     1,SYSDATE,1,'SH','SELECT AVG(amount_sold)
                                     FROM sh.sales');
  DBMS_ADVISOR.EXECUTE_TASK(task_name);
  DBMS_ADVISOR.CREATE_FILE(DBMS_ADVISOR.GET_TASK_SCRIPT(task_name),
    'MY_DIR','script.sql');

END;
/

CREATE_OBJECT Procedure

This procedure creates a new task object.

Syntax

DBMS_ADVISOR.CREATE_OBJECT (
   task_name         IN VARCHAR2,
   object_type       IN VARCHAR2,
   attr1             IN VARCHAR2 :=  NULL,
   attr2             IN VARCHAR2 :=  NULL,
   attr3             IN VARCHAR2 :=  NULL,
   attr4             IN CLOB     :=  NULL,
   object_id         OUT NUMBER);

DBMS_ADVISOR.CREATE_OBJECT (
   task_name         IN VARCHAR2,
   object_type       IN VARCHAR2,
   attr1             IN VARCHAR2 :=  NULL,
   attr2             IN VARCHAR2 :=  NULL,
   attr3             IN VARCHAR2 :=  NULL,
   attr4             IN CLOB     :=  NULL,
   attr5             IN VARCHAR2 :=  NULL,
   object_id         OUT NUMBER);

Parameters

Table 12-6 CREATE_OBJECT Procedure Parameters

Parameter Description
task_name A valid Advisor task name that uniquely identifies an existing task.
object_type Specifies the external object type.
attr1 Advisor-specific data.
attr2 Advisor-specific data.
attr3 Advisor-specific data.
attr4 Advisor-specific data.
attr5 Advisor-specific data.
object_id The advisor-assigned object identifier.

The attribute parameters have different values depending upon the object type. See Oracle Database Administrator's Guide for details regarding these parameters and object types.

Return Values

Returns the new object identifier.

Usage Notes

Task objects are typically used as input data for a particular advisor. Segment advice can be generated at the object, segment, or tablespace level. If for the object level, advice is generated on all partitions of the object (if the object is partitioned). The advice is not cascaded to any dependent objects. If for the segment level, advice can be obtained on a single segment, such as the partition or subpartition of a table, index, or LOB column. If for a tablespace level, target advice for every segment in the tablespace will be generated.

See Oracle Database Administrator's Guide for further information regarding the Segment Advisor.

Examples

DECLARE
  task_id NUMBER;
  task_name VARCHAR2(30);
  obj_id NUMBER;
BEGIN
  task_name := 'My Task';

  DBMS_ADVISOR.CREATE_TASK(DBMS_ADVISOR.SQLACCESS_ADVISOR, task_id, task_name);
  DBMS_ADVISOR.CREATE_OBJECT (task_name,'SQL',NULL,NULL,NULL,
                              'SELECT * FROM SH.SALES',obj_id);
END;
/

CREATE_SQLWKLD Procedure

This procedure creates a new private SQL Workload object for the user. A SQL Workload object manages a SQL workload on behalf of the SQL Access Advisor. A SQL Workload object must exist prior to performing any other SQL Workload operations, such as importing or updating SQL statements.

Syntax

DBMS_ADVISOR.CREATE_SQLWKLD (
   workload_name            IN OUT VARCHAR2,
   description              IN VARCHAR2 := NULL,
   template                 IN VARCHAR2 := NULL,
   is_template              IN VARCHAR2 := 'FALSE');

Parameters

Table 12-7 CREATE_SQLWKLD Procedure Parameters

Parameter Description
workload_name A name that uniquely identifies the created workload. If not specified, the system will generate a unique name. Names can be up to 30 characters long.
description Specifies an optional workload description. Descriptions can be up to 256 characters.
template An optional SQL Workload name of an existing workload data object or data object template.
is_template An optional value that enables you to set the newly created workload as a template. Valid values are TRUE and FALSE.

Return Values

The SQL Access Advisor returns a unique workload object identifier number that must be used for subsequent activities within the new SQL Workload object.

Usage Notes

By default, workload objects are created using built-in default settings. To create a workload using the parameter settings of an existing workload or workload template, the user may specify an existing workload name.

Once a SQL Workload object is present, it can then be referenced by one or more SQL Access Advisor tasks using the ADD_SQLWKLD_REF procedure.

Examples

DECLARE
  workload_name VARCHAR2(30);
BEGIN
  workload_name := 'My Workload';

  DBMS_ADVISOR.CREATE_SQLWKLD(workload_name, 'My Workload');
END;
/

CREATE_TASK Procedures

This procedure creates a new Advisor task in the repository.

Syntax

DBMS_ADVISOR.CREATE_TASK (
   advisor_name          IN VARCHAR2,
   task_id               OUT NUMBER,
   task_name             IN OUT VARCHAR2,
   task_desc             IN VARCHAR2 := NULL,
   template              IN VARCHAR2 := NULL,
   is_template           IN VARCHAR2 := 'FALSE',
   how_created           IN VARCHAR2 := NULL);

DBMS_ADVISOR.CREATE_TASK (
   advisor_name          IN VARCHAR2,
   task_name             IN VARCHAR2,
   task_desc             IN VARCHAR2 := NULL,
   template              IN VARCHAR2 := NULL,
   is_template           IN VARCHAR2 := 'FALSE',
   how_created           IN VARCHAR2 := NULL);

Parameters

Table 12-8 CREATE_TASK Procedure Parameters

Parameter Description
advisor_name Specifies the unique advisor name as defined in the view DBA_ADVISOR_DEFINITIONS.
task_id A number that uniquely identifies the created task. The number is generated by the procedure and returned to the user.
task_name Specifies a new task name. Names must be unique among all tasks for the user.

When using the second form of the CREATE_TASK syntax listed above (with OUT), a unique name can be generated. Names can be up to 30 characters long.

task_desc Specifies an optional task description. Descriptions can be up to 256 characters in length.
template An optional task name of an existing task or task template. To specify built-in SQL Access Advisor templates, use the template name as described earlier.
is_template An optional value that allows the user to set the newly created task as template. Valid values are: TRUE and FALSE.
how_created An optional value that identifies how the source was created.

Return Values

Returns a unique task ID number and a unique task name if one is not specified.

Usage Notes

A task must be associated with an advisor, and once the task has been created, it is permanently associated with the original advisor. By default, tasks are created using built-in default settings. To create a task using the parameter settings of an existing task or task template, the user may specify an existing task name.

For the SQL Access Advisor, use the identifier DBMS_ADVISOR.SQLACCESS_ADVISOR as the advisor_name.

The SQL Access Advisor provides three built-in task templates, using the following constants:

Examples

DECLARE
  task_id NUMBER;
  task_name VARCHAR2(30);
BEGIN
  task_name := 'My Task';
  DBMS_ADVISOR.CREATE_TASK(DBMS_ADVISOR.SQLACCESS_ADVISOR, task_id, task_name);
END;
/

DELETE_SQLWKLD Procedure

This procedure deletes an existing SQL Workload object from the repository.

Syntax

DBMS_ADVISOR.DELETE_SQLWKLD (
   workload_name        IN VARCHAR2);

Parameters

Table 12-9 DELETE_SQLWKLD Procedure Parameters

Parameter Description
workload_name The workload object name that uniquely identifies an existing workload. The wildcard % is supported as a WORKLOAD_NAME. The rules of use are identical to the LIKE operator. For example, to delete all tasks for the current user, use the wildcard % as the WORKLOAD_NAME. If a wildcard is provided, the DELETE_SQLWKLD operation will not delete any workloads marked as READ_ONLY or TEMPLATE.

Usage Notes

A workload cannot be modified or deleted if it is currently referenced by an active task. A task is considered active if it is not in its initial state. See the "RESET_TASK Procedure" to set a task to its initial state.

Examples

DECLARE
  workload_name VARCHAR2(30);
BEGIN
  workload_name := 'My Workload';

  DBMS_ADVISOR.CREATE_SQLWKLD(workload_name, 'My Workload');
  DBMS_ADVISOR.DELETE_SQLWKLD(workload_name);
END;
/

DELETE_SQLWKLD_REF Procedure

This procedure removes a link between the current SQL Access task and a SQL Workload data object.

Syntax

DBMS_ADVISOR.DELETE_SQLWKLD_REF (
   task_name              IN VARCHAR2,
   workload_name          IN NUMBER);

Parameters

Table 12-10 DELETE_SQLWKLD_REF Procedure Parameters

Parameter Description
task_name The SQL Access task name that uniquely identifies an existing task.
workload_name The name of the workload object to be unlinked. The wildcard % is supported as a workload_name. The rules of use are identical to the LIKE operator. For example, to remove all links to workload objects, use the wildcard % as the workload_name.

Examples

DECLARE
  task_id NUMBER;
  task_name VARCHAR2(30);
  workload_name VARCHAR2(30);
BEGIN
  task_name := 'My Task';
  workload_name := 'My Workload';

  DBMS_ADVISOR.CREATE_TASK(DBMS_ADVISOR.SQLACCESS_ADVISOR, task_id, task_name);
  DBMS_ADVISOR.CREATE_SQLWKLD(workload_name, 'My Workload');
  DBMS_ADVISOR.ADD_SQLWKLD_REF(task_name, workload_name);
  DBMS_ADVISOR.ADD_SQLWKLD_STATEMENT(workload_name, 'MONTHLY', 'ROLLUP',
                                     100,400,5041,103,640445,680000,2,
                                     1,SYSDATE,1,'SH','SELECT AVG(amount_sold) 
                                     FROM sh.sales');
  DBMS_ADVISOR.DELETE_SQLWKLD_REF(task_name, workload_name);
END;
/

DELETE_SQLWKLD_STATEMENT Procedure

This procedure deletes one or more statements from a workload.

Syntax

DBMS_ADVISOR.DELETE_SQLWKLD_STATEMENT (
   workload_name        IN VARCHAR2,
   sql_id               IN NUMBER);

DBMS_ADVISOR.DELETE_SQLWKLD_STATEMENT (
   workload_name        IN VARCHAR2,
   search               IN VARCHAR2,
   deleted              OUT NUMBER);

Parameters

Table 12-11 DELETE_SQLWKLD_STATEMENT Procedure Parameters

Parameter Description
workload_name The workload object name that uniquely identifies an existing workload.
sql_id The Advisor-generated identifier number that is assigned to the statement. To specify all workload statements, use the constant ADVISOR_ALL.
search Disabled.
deleted Returns the number of statements deleted by the searched deleted operation.

Usage Notes

A workload cannot be modified or deleted if it is currently referenced by an active task. A task is considered active if it is not in its initial state. See the "RESET_TASK Procedure" to set a task to its initial state.

Examples

DECLARE
  workload_name VARCHAR2(30);
  deleted NUMBER;
  id NUMBER;
BEGIN
  workload_name := 'My Workload';

  DBMS_ADVISOR.CREATE_SQLWKLD(workload_name, 'My Workload');
  DBMS_ADVISOR.ADD_SQLWKLD_STATEMENT(workload_name, 'YEARLY', 'ROLLUP',
                                     100,400,5041,103,640445,680000,2,
                                     1,SYSDATE,1,'SH','SELECT AVG(amount_sold)
                                     FROM sh.sales');

   SELECT sql_id INTO id FROM USER_ADVISOR_SQLW_STMTS
   WHERE workload_name = 'My Workload';

  DBMS_ADVISOR.DELETE_SQLWKLD_STATEMENT(workload_name, id);
END;
/

DELETE_TASK Procedure

This procedure deletes an existing task from the repository.

Syntax

DBMS_ADVISOR.DELETE_TASK (
   task_name          IN VARCHAR2);

Parameters

Table 12-12 DELETE_TASK Procedure Parameters

Parameter Description
task_name A single Advisor task name that will be deleted from the repository.

The wildcard % is supported as a TASK_NAME. The rules of use are identical to the LIKE operator. For example, to delete all tasks for the current user, use the wildcard % as the TASK_NAME.

If a wildcard is provided, the DELETE_TASK operation will not delete any tasks marked as READ_ONLY or TEMPLATE.


Examples

DECLARE
  task_id NUMBER;
  task_name VARCHAR2(30);
BEGIN
  task_name := 'My Task';

  DBMS_ADVISOR.CREATE_TASK(DBMS_ADVISOR.SQLACCESS_ADVISOR, task_id, task_name);
  DBMS_ADVISOR.DELETE_TASK(task_name);
END;
/

EXECUTE_TASK Procedure

This procedure performs the Advisor analysis or evaluation for the specified task.

Syntax

DBMS_ADVISOR.EXECUTE_TASK (
   task_name          IN VARCHAR2);

Parameters

Table 12-13 EXECUTE_TASK Procedure Parameters

Parameter Description
task_name The task name that uniquely identifies an existing task.

Usage Notes

Task execution is a synchronous operation. Control will not be returned to the caller until the operation has completed, or a user-interrupt was detected.

Upon return, you can check the DBA_ADVISOR_LOG table for the execution status.

Examples

DECLARE
  task_id NUMBER;
  task_name VARCHAR2(30);
  workload_name VARCHAR2(30);
BEGIN
  task_name := 'My Task';
  workload_name := 'My Workload';

  DBMS_ADVISOR.CREATE_TASK(DBMS_ADVISOR.SQLACCESS_ADVISOR, task_id, task_name);
  DBMS_ADVISOR.CREATE_SQLWKLD(workload_name, 'My Workload');
  DBMS_ADVISOR.ADD_SQLWKLD_REF(task_name, workload_name);
  DBMS_ADVISOR.ADD_SQLWKLD_STATEMENT(workload_name, 'MONTHLY', 'ROLLUP',
                                     100,400,5041,103,640445,680000,2,
                                     1,SYSDATE,1,'SH','SELECT AVG(amount_sold)
                                     FROM sh.sales');
  DBMS_ADVISOR.EXECUTE_TASK(task_name);
END;
/

GET_REC_ATTRIBUTES Procedure

This procedure retrieves a specified attribute of a new object as recommended by Advisor analysis.

Syntax

DBMS_ADVISOR.GET_REC_ATTRIBUTES (
   workload_name         IN VARCHAR2,
   rec_id                IN NUMBER,
   action_id             IN NUMBER,
   attribute_name        IN VARCHAR2,
   value                 OUT VARCHAR2,
   owner_name            IN VARCHAR2 := NULL);

Parameters

Table 12-14 GET_REC_ATTRIBUTES Procedure Parameters

Parameter Description
task_name The task name that uniquely identifies an existing task.
rec_id The Advisor-generated identifier number that is assigned to the recommendation.
action_id The Advisor-generated action identifier that is assigned to the particular command.
attribute_name Specifies the attribute to change.
value The buffer to receive the requested attribute value.
owner_name Optional owner name of the target task. This permits access to task data not owned by the current user.

Return Values

The requested attribute value is returned in the VALUE argument.

Examples

DECLARE
  task_id NUMBER;
  task_name VARCHAR2(30);
  workload_name VARCHAR2(30);
  attribute VARCHAR2(100);
BEGIN
  task_name := 'My Task';
  workload_name := 'My Workload';
  DBMS_ADVISOR.CREATE_TASK(DBMS_ADVISOR.SQLACCESS_ADVISOR, task_id, task_name);
  DBMS_ADVISOR.CREATE_SQLWKLD(workload_name, 'My Workload');
  DBMS_ADVISOR.ADD_SQLWKLD_REF(task_name, workload_name);
  DBMS_ADVISOR.ADD_SQLWKLD_STATEMENT(workload_name, 'MONTHLY', 'ROLLUP',
                                     100,400,5041,103,640445,680000,2,
                                     1,SYSDATE,1,'SH','SELECT AVG(amount_sold)
                                     FROM sh.sales WHERE promo_id = 10');
  DBMS_ADVISOR.EXECUTE_TASK(task_name);
  DBMS_ADVISOR.GET_REC_ATTRIBUTES(task_name, 1, 1, 'NAME', attribute);
END;
/

GET_TASK_REPORT Function

This function creates and returns a report for the specified task.

Syntax

DBMS_ADVISOR.GET_TASK_REPORT (
   task_name      IN VARCHAR2,
   type           IN VARCHAR2 := 'TEXT',
   level          IN VARCHAR2 := 'TYPICAL',
   section        IN VARCHAR2 := 'ALL',
   owner_name     IN VARCHAR2 := NULL)
RETURN CLOB;

Parameters

Table 12-15 GET_TASK_REPORT Function Parameters

Parameter Description
task_name The name of the task from which the script will be created.
type The only valid value is TEXT.
level The possible values are BASIC, TYPICAL, and ALL.
section Advisor-specific report sections.
owner_name Owner of the task. If specified, the system will check to see if the current user has read privileges to the task data.

Return Values

Returns the buffer receiving the script.


GET_TASK_SCRIPT Function

This function creates a SQL*Plus-compatible SQL script and sends the output to file. The script will contain all of the accepted recommendations from the specified task.

Syntax

DBMS_ADVISOR.GET_TASK_SCRIPT (
   task_name          IN VARCHAR2
   type               IN VARCHAR2 := 'IMPLEMENTATION',
   rec_id             IN NUMBER := NULL,
   act_id             IN NUMBER := NULL,
   owner_name         IN VARCHAR2 := NULL)
RETURN CLOB;

Parameters

Table 12-16 GET_TASK_SCRIPT Function Parameters

Parameter Description
task_name The task name that uniquely identifies an existing task.
type Specifies the type of script to generate. The possible values are IMPLEMENTATION and UNDO.
rec_id An optional recommendation identifier number that can be used to extract a subset of the implementation script.

A zero or the value DBMS_ADVISOR.ADVISOR_ALL indicates all accepted recommendations would be included. The default is to include all accepted recommendations for the task.

act_id Optional action identifier number that can be used to extract a single action as a DDL command.

A zero or the value DBMS_ADVISOR.ADVISOR_ALL indicates all actions for the recommendation would be included. The default is to include all actions for a recommendation.

owner_name Optional task owner name.

Return Values

Returns the script as a CLOB buffer.

Usage Notes

Though the script is ready to execute, Oracle recommends that the user review the script for acceptable locations for new materialized views and indexes.

For a recommendation to appear in a generated script, it must be marked as accepted.

Examples

DECLARE
  task_id NUMBER;
  task_name VARCHAR2(30);
  workload_name VARCHAR2(30);
  buf CLOB;
BEGIN
  task_name := 'My Task';
  workload_name := 'My Workload';

  DBMS_ADVISOR.CREATE_TASK(DBMS_ADVISOR.SQLACCESS_ADVISOR, task_id, task_name);
  DBMS_ADVISOR.CREATE_SQLWKLD(workload_name, 'My Workload');
  DBMS_ADVISOR.ADD_SQLWKLD_REF(task_name, workload_name);
  DBMS_ADVISOR.ADD_SQLWKLD_STATEMENT(workload_name, 'MONTHLY', 'ROLLUP',
                                     100,400,5041,103,640445,680000,2,
                                     1,SYSDATE,1,'SH','SELECT AVG(amount_sold)
                                     FROM sh.sales');
  DBMS_ADVISOR.EXECUTE_TASK(task_name);
    buf := DBMS_ADVISOR.GET_TASK_SCRIPT(task_name);
END;
/

IMPLEMENT_TASK Procedure

Implements the recommendations of the specified task.

Syntax

DBMS_ADVISOR.IMPLEMENT_TASK (
   task_name          IN VARCHAR2,
   rec_id             IN NUMBER := NULL,
   exit_on_error      IN BOOLEAN := NULL);

Parameters

Table 12-17 IMPLEMENT_TASK Procedure Parameters

Parameter Description
task_name The name of the task.
rec_id An optional recommendation ID.
exit_on_error An optional boolean to exit on the first error.


IMPORT_SQLWKLD_SCHEMA Procedure

This procedure constructs and loads a SQL workload based on schema evidence. The workload is also referred to as a hypothetical workload.

Syntax

DBMS_ADVISOR.IMPORT_SQLWKLD_SCHEMA (
   workload_name         IN VARCHAR2,
   import_mode           IN VARCHAR2 := 'NEW',
   priority              IN NUMBER := 2,
   saved_rows            OUT NUMBER,
   failed_rows           OUT NUMBER);

Parameters

Table 12-18 IMPORT_SQLWKLD_SCHEMA Procedure Parameters

Parameter Description
workload_name The workload object name that uniquely identifies an existing workload.
import_mode Specifies the action to be taken when storing the workload. Possible values are:
  • APPEND Indicates that the collected workload will be added to any existing workload in the task.

  • NEW Indicates that the collected workload will be the exclusive workload for the task. If an existing workload is found, an exception will be thrown.

  • REPLACE Indicates the collected workload will be the exclusive workload for the task. If an existing workload is found, it will be deleted prior to saving the new workload.

The default value is NEW.

priority Specifies the application priority for each statement that is saved in the workload object. The value must be one of the following: 1-HIGH, 2-MEDIUM, or 3-LOW.
failed_rows Returns the number or rows that were not saved due to syntax or validation errors
saved_rows Returns the number of rows actually saved in the repository.

Return Values

This call returns the number of rows saved and failed as output parameters.

Usage Notes

To successfully import a hypothetical workload, the target schemas must contain dimensions.

If the VALID_TABLE_LIST parameter is not set, the search space may become very large and require a significant amount of time to complete. Oracle Corporation recommends that you limit your search space to specific set of tables.

If a task contains valid recommendations from a prior run, adding or modifying task will mark the task as invalid, preventing the viewing and reporting of potentially valuable recommendation data.

Examples

DECLARE
  workload_name VARCHAR2(30);
  saved NUMBER;
  failed NUMBER;
BEGIN
  workload_name := 'My Workload';

  DBMS_ADVISOR.CREATE_SQLWKLD(workload_name, 'My Workload');
  DBMS_ADVISOR.SET_SQLWKLD_PARAMETER(workload_name,'VALID_TABLE_LIST','SH.%');
  DBMS_ADVISOR.IMPORT_SQLWKLD_SCHEMA(workload_name, 'REPLACE', 1, saved,
     failed);
END;
/

IMPORT_SQLWKLD_SQLCACHE Procedure

This procedure creates a SQL workload from the current contents of the server's SQL cache.

Syntax

DBMS_ADVISOR.IMPORT_SQLWKLD_SQLCACHE (
   workload_name         IN VARCHAR2,
   import_mode           IN VARCHAR2 := 'NEW',
   priority              IN NUMBER := 2,
   saved_rows            OUT NUMBER,
   failed_rows           OUT NUMBER);

Parameters

Table 12-19 IMPORT_SQLWKLD_SQLCACHE Procedure Parameters

Parameter Description
workload_name The workload object name that uniquely identifies an existing workload.
import_mode Specifies the action to be taken when storing the workload. Possible values are:
  • APPEND Indicates that the collected workload will be added to any existing workload in the task.

  • NEW Indicates that the collected workload will be the exclusive workload for the task. If an existing workload is found, an exception will be thrown.

  • REPLACE Indicates the collected workload will be the exclusive workload for the task. If an existing workload is found, it will be deleted prior to saving the new workload.

The default value is NEW.

priority Specifies the application priority for each statement that is saved in the workload object. The value must be one of the following 1-HIGH, 2-MEDIUM, or 3-LOW.
saved_rows Returns the number of rows saved as output parameters.
failed_rows Returns the number of rows that were not saved due to syntax or validation errors.

Return Values

This call returns the number of rows saved and failed as output parameters.

Usage Notes

A workload cannot be modified or deleted if it is currently referenced by an active task. A task is considered active if it is not in its initial state. See "RESET_TASK Procedure" to set a task to its initial state.

Examples

DECLARE
  workload_name VARCHAR2(30);
  saved NUMBER;
  failed NUMBER;
BEGIN
  workload_name := 'My Workload';

  DBMS_ADVISOR.CREATE_SQLWKLD(workload_name, 'My Workload');
  DBMS_ADVISOR.SET_SQLWKLD_PARAMETER(workload_name,'VALID_TABLE_LIST','SH.%');
  DBMS_ADVISOR.IMPORT_SQLWKLD_SQLCACHE(workload_name, 'REPLACE', 1, saved,
     failed);
END;
/

IMPORT_SQLWKLD_STS Procedure

This procedure loads a SQL workload from an existing SQL Tuning Set. A SQL Tuning Set is typically created from the server workload repository using various time and data filters.

Syntax

DBMS_ADVISOR.IMPORT_SQLWKLD_STS (
   workload_name         IN VARCHAR2,
   sts_name              IN VARCHAR2,
   import_mode           IN VARCHAR2 := 'NEW',
   priority              IN NUMBER := 2,
   saved_rows            OUT NUMBER,
   failed_rows           OUT NUMBER);

DBMS_ADVISOR.IMPORT_SQLWKLD_STS (
   workload_name         IN VARCHAR2,
   sts_owner             IN VARCHAR2,
   sts_name              IN VARCHAR2,
   import_mode           IN VARCHAR2 := 'NEW',
   priority              IN NUMBER := 2,
   saved_rows            OUT NUMBER,
   failed_rows           OUT NUMBER);

Parameters

Table 12-20 IMPORT_SQLWKLD_STS Procedure Parameters

Parameter Description
workload_name The workload object name that uniquely identifies an existing workload.
sts_owner The optional owner of the SQL Tuning Set.
sts_name The name of an existing SQL Tuning Set workload from which the data will be imported. If the sts_owner value is not provided, the owner will default to the current user.
import_mode Specifies the action to be taken when storing the workload. Possible values are:
  • APPEND Indicates that the collected workload will be added to any existing workload in the task.

  • NEW Indicates that the collected workload will be the exclusive workload for the task. If an existing workload is found, an exception will be thrown.

  • REPLACE Indicates the collected workload will be the exclusive workload for the task. If an existing workload is found, it will be deleted prior to saving the new workload.

The default value is NEW.

priority Specifies the application priority for each statement that is saved in the workload object. The value must be one of the following: 1-HIGH, 2-MEDIUM, or 3-LOW. The default value is 2.
saved_rows Returns the number of rows actually saved in the repository.
failed_rows Returns the number of rows that were not saved due to syntax or validation errors.

Return Values

This call returns the number of rows saved and failed as output parameters.

Usage Notes

A workload cannot be modified or deleted if it is currently referenced by an active task. A task is considered active if it is not in its initial state. See "RESET_TASK Procedure" to set a task to its initial state.

Examples

DECLARE
  workload_name VARCHAR2(30);
  saved NUMBER;
  failed NUMBER;
BEGIN
  workload_name := 'My Workload';

  DBMS_ADVISOR.CREATE_SQLWKLD(workload_name, 'My Workload');
  DBMS_ADVISOR.SET_SQLWKLD_PARAMETER(workload_name,'VALID_TABLE_LIST','SH.%');
  DBMS_ADVISOR.IMPORT_SQLWKLD_STS(workload_name, 'MY_SQLSET', 'REPLACE', 1,
     saved, failed);
END;
/

IMPORT_SQLWKLD_SUMADV Procedure

This procedure collects a SQL workload from a Summary Advisor workload. This procedure is intended to assist Oracle9i Database Summary Advisor users in the migration to SQL Access Advisor.

Syntax

DBMS_ADVISOR.IMPORT_SQLWKLD_SUMADV (
   workload_name         IN VARCHAR2,
   import_mode           IN VARCHAR2 := 'NEW',
   priority              IN NUMBER := 2,
   sumadv_id             IN NUMBER,
   saved_rows            OUT NUMBER,
   failed_rows           OUT NUMBER);

Parameters

Table 12-21 IMPORT_SQLWKLD_SUMADV Procedure Parameters

Parameter Description
workload_name The workload object name that uniquely identifies an existing workload.
import_mode Specifies the action to be taken when storing the workload. Possible values are:
  • APPEND Indicates that the collected workload will be added to any existing workload in the task.

  • NEW Indicates that the collected workload will be the exclusive workload for the task. If an existing workload is found, an exception will be thrown.

  • REPLACE Indicates the collected workload will be the exclusive workload for the task. If an existing workload is found, it will be deleted prior to saving the new workload.

The default value is NEW.

priority Specifies the default application priority for each statement that is saved in the workload object. If a Summary Advisor workload statement contains a priority of zero, the default priority will be applied. If the workload statement contains a valid priority, then the Summary Advisor priority will be converted to a comparable SQL Access Advisor priority. The value must be one of the following:

1-HIGH, 2-MEDIUM, or 3-LOW.

sumadv_id Specifies the Summary Advisor workload identifier number.
saved_rows Returns the number of rows actually saved in the repository.
failed_rows Returns the number of rows that were not saved due to syntax or validation errors.

Return Values

This call returns the number of rows saved and failed as output parameters.

Usage Notes

A workload cannot be modified or deleted if it is currently referenced by an active task. A task is considered active if it is not in its initial state. See "RESET_TASK Procedure" to set a task to its initial state.

Examples

DECLARE
  workload_name VARCHAR2(30);
  saved NUMBER;
  failed NUMBER;
  sumadv_id NUMBER;
BEGIN
  workload_name := 'My Workload';
  sumadv_id := 394;

  DBMS_ADVISOR.CREATE_SQLWKLD(workload_name, 'My Workload');
  DBMS_ADVISOR.SET_SQLWKLD_PARAMETER(workload_name,'VALID_TABLE_LIST','SH.%');
  DBMS_ADVISOR.IMPORT_SQLWKLD_SUMADV(workload_name, 'REPLACE', 1, sumadv_id,
    saved, failed);
END;
/

IMPORT_SQLWKLD_USER Procedure

This procedure collects a SQL workload from a specified user table.

Syntax

DBMS_ADVISOR.IMPORT_SQLWKLD_USER (
   workload_name         IN VARCHAR2,
   import_mode           IN VARCHAR2 := 'NEW',
   owner_name            IN VARCHAR2,
   table_name            IN VARCHAR2,
   saved_rows            OUT NUMBER,
   failed_rows           OUT NUMBER);

Parameters

Table 12-22 IMPORT_SQLWKLD_USER Procedure Parameters

Parameter Description
workload_name The workload object name that uniquely identifies an existing workload.
import_mode Specifies the action to be taken when storing the workload. Possible values are:
  • APPEND Indicates that the collected workload will be added to any existing workload in the task.

  • NEW Indicates that the collected workload will be the exclusive workload for the task. If an existing workload is found, an exception will be thrown.

  • REPLACE Indicates the collected workload will be the exclusive workload for the task. If an existing workload is found, it will be deleted prior to saving the new workload.

The default value is NEW.

owner_name Specifies the owner name of the table or view from which workload data will be collected.
table_name Specifies the name of the table or view from which workload data will be collected.
saved_rows Returns the number of rows actually saved in the workload object.
failed_rows Returns the number of rows that were not saved due to syntax or validation errors.

Return Values

This call returns the number of rows saved and failed as output parameters.

Usage Notes

A workload cannot be modified or deleted if it is currently referenced by an active task. A task is considered active if it is not in its initial state. See "RESET_TASK Procedure" to set a task to its initial state.

Examples

DECLARE
  workload_name VARCHAR2(30);
  saved NUMBER;
  failed NUMBER;
BEGIN
  workload_name := 'My Workload';

  DBMS_ADVISOR.CREATE_SQLWKLD(workload_name, 'My Workload');
  DBMS_ADVISOR.SET_SQLWKLD_PARAMETER(workload_name,'VALID_TABLE_LIST','SH.%');
  DBMS_ADVISOR.IMPORT_SQLWKLD_USER(workload_name, 'REPLACE', 'SH', 
    'USER_WORKLOAD', saved, failed);
END;
/

INTERRUPT_TASK Procedure

This procedure stops a currently executing task. The task will end its operations as it would at a normal exit. The user will be able to access any recommendations that exist to this point.

Syntax

DBMS_ADVISOR.INTERRUPT_TASK (
   task_name          IN VARCHAR2);

Parameters

Table 12-23 INTERRUPT_TASK Procedure Parameters

Parameter Description
task_name A single Advisor task name that will be interrupted.

Examples

DECLARE
  task_id NUMBER;
  task_name VARCHAR2(30);
BEGIN
  task_name := 'My Task';

  DBMS_ADVISOR.CREATE_TASK(DBMS_ADVISOR.SQLACCESS_ADVISOR, task_id, task_name);
  DBMS_ADVISOR.EXECUTE_TASK(task_name);
END;
/

While this session is executing its task, you can interrupt the task from a second session using the following statement:

BEGIN
  DBMS_ADVISOR.INTERRUPT_TASK('My Task');
END;
/

MARK_RECOMMENDATION Procedure

This procedure marks a recommendation for import or implementation.

Syntax

DBMS_ADVISOR.MARK_RECOMMENDATION (
   task_name          IN VARCHAR2
   id                 IN NUMBER,
   action             IN VARCHAR2);

Parameters

Table 12-24 MARK_RECOMMENDATION Procedure Parameters

Parameter Description
task_name Name of the task.
id The recommendation identifier number assigned by the Advisor.
action The recommendation action setting. The possible actions are:
  • ACCEPT Marks the recommendation as accepted. With this setting, the recommendation will appear in implementation and undo scripts.

  • IGNORE Marks the recommendation as ignore. With this setting, the recommendation will not appear in an implementation or undo script.

  • REJECT Marks the recommendation as rejected. With this setting, the recommendation will not appear in any implementation or undo scripts.


Usage Notes

For a recommendation to be implemented, it must be marked as accepted. By default, all recommendations are considered accepted and will appear in any generated scripts.

Examples

DECLARE
  task_id NUMBER;
  task_name VARCHAR2(30);
  workload_name VARCHAR2(30);
  attribute VARCHAR2(100);
  rec_id NUMBER;
BEGIN
  task_name := 'My Task';
  workload_name := 'My Workload';

  DBMS_ADVISOR.CREATE_TASK(DBMS_ADVISOR.SQLACCESS_ADVISOR, task_id, task_name);
  DBMS_ADVISOR.CREATE_SQLWKLD(workload_name, 'My Workload');
  DBMS_ADVISOR.ADD_SQLWKLD_REF(task_name, workload_name);
  DBMS_ADVISOR.ADD_SQLWKLD_STATEMENT(workload_name, 'MONTHLY', 'ROLLUP',
                                     100,400,5041,103,640445,680000,2,
                                     1,SYSDATE,1,'SH','SELECT AVG(amount_sold)
                                     FROM sh.sales WHERE promo_id = 10');
  DBMS_ADVISOR.EXECUTE_TASK(task_name);

  rec_id := 1;
  DBMS_ADVISOR.MARK_RECOMMENDATION(task_name, rec_id, 'REJECT');
END;
/

QUICK_TUNE Procedure

This procedure performs an analysis and generates recommendations for a single SQL statement.

This provides a shortcut method of all necessary operations to analyze the specified SQL statement. The operation creates a task using the specified task name. The task will be created using a specified Advisor task template. Finally, the task will be executed and the results will be saved in the repository.

Syntax

DBMS_ADVISOR.QUICK_TUNE (
   advisor_name           IN VARCHAR2,
   task_name              IN VARCHAR2,
   attr1                  IN CLOB,
   attr2                  IN VARCHAR2 := NULL,
   attr3                  IN NUMBER := NULL,
   task_or_template       IN VARCHAR2 := NULL);

Parameters

Table 12-25 QUICK_TUNE Procedure Parameters

Parameter Description
advisor_name Name of the Advisor that will perform the analysis.
task_name Name of the task.
attr1 Advisor-specific attribute in the form of a CLOB variable.
attr2 Advisor-specific attribute in the form of a VARCHAR2 variable.
attr3 Advisor-specific attribute in the form of a NUMBER.
task_or_template An optional task name of an existing task or task template.

Usage Notes

If indicated by the user, the final recommendations can be implemented by the procedure.

The task will be created using either a specified SQL Access task template or the built-in default template of SQLACCESS_GENERAL. The workload will only contain the specified statement, and all task parameters will be defaulted.

attr1 must be the single SQL statement to tune. For the SQL Access Advisor, attr2 is the user who would execute the single statement. If omitted, the current user will be used.

Examples

DECLARE
  task_name VARCHAR2(30);
BEGIN
  task_name := 'My Task';

  DBMS_ADVISOR.QUICK_TUNE(DBMS_ADVISOR.SQLACCESS_ADVISOR, task_name,
                  'SELECT AVG(amount_sold) FROM sh.sales WHERE promo_id=10');
END;
/

RESET_SQLWKLD Procedure

This procedure resets a workload to its initial starting point. This has the effect of removing all journal messages, log messages, and recalculating necessary volatility and usage statistics.

Syntax

DBMS_ADVISOR.RESET_SQLWKLD (
   workload_name        IN VARCHAR2);

Parameters

Table 12-26 RESET_SQLWKLD Procedure Parameters

Parameter Description
workload_name The SQL Workload object name that uniquely identifies an existing workload.

Usage Notes

RESET_SQLWKLD should be executed after any workload adjustments such as adding or removing SQL statements.

Examples

DECLARE
  workload_name VARCHAR2(30);
BEGIN
  workload_name := 'My Workload';

  DBMS_ADVISOR.CREATE_SQLWKLD(workload_name, 'My Workload');
  DBMS_ADVISOR.ADD_SQLWKLD_STATEMENT(workload_name, 'MONTHLY', 'ROLLUP',
                                     100,400,5041,103,640445,680000,2,
                                     1,SYSDATE,1,'SH','SELECT AVG(amount_sold)
                                     FROM sh.sales WHERE promo_id = 10');

  DBMS_ADVISOR.RESET_SQLWKLD(workload_name);
END;
/

RESET_TASK Procedure

This procedure resets a task to its initial state. All intermediate and recommendation data will be removed from the task. The task status will be set to INITIAL.

Syntax

DBMS_ADVISOR.RESET_TASK (
   task_name          IN VARCHAR2);

Parameters

Table 12-27 RESET_TASK Procedure Parameters

Parameter Description
task_name The task name that uniquely identifies an existing task.

Examples

DECLARE
  task_id NUMBER;
  task_name VARCHAR2(30);
  workload_name VARCHAR2(30);
BEGIN
  task_name := 'My Task';
  workload_name := 'My Workload';

  DBMS_ADVISOR.CREATE_TASK(DBMS_ADVISOR.SQLACCESS_ADVISOR, task_id, task_name);
  DBMS_ADVISOR.CREATE_SQLWKLD(workload_name, 'My Workload');
  DBMS_ADVISOR.ADD_SQLWKLD_REF(task_name, workload_name);
  DBMS_ADVISOR.ADD_SQLWKLD_STATEMENT(workload_name, 'MONTHLY', 'ROLLUP',
                                     100,400,5041,103,640445,680000,2,
                                     1,SYSDATE,1,'SH','SELECT AVG(amount_sold)
                                     FROM sh.sales WHERE promo_id = 10');
  DBMS_ADVISOR.EXECUTE_TASK(task_name);

  DBMS_ADVISOR.RESET_TASK(task_name);
END;
/

SET_DEFAULT_SQLWKLD_PARAMETER Procedure

This procedure modifies the default value for a user parameter within a SQL Workload object or SQL Workload object template. A user parameter is a simple variable that stores various attributes that affect workload collection, tuning decisions and reporting. When a default value is changed for a parameter, workload objects will inherit the new value when they are created.

Syntax

DBMS_ADVISOR.SET_DEFAULT_SQLWKLD_PARAMETER (
   parameter            IN VARCHAR2,
   value                IN VARCHAR2);

DBMS_ADVISOR.SET_DEFAULT_SQLWKLD_PARAMETER (
   parameter            IN VARCHAR2,
   value                IN NUMBER);

Parameters

Table 12-28 SET_DEFAULT_SQLWKLD_PARAMETER Procedure Parameters

Parameter Description
parameter The name of the data parameter to be modified. Parameter names are not case sensitive. Parameter names are unique to the workload object type, but not necessarily unique to all workload object types. Various object types may use the same parameter name for different purposes.
value The value of the specified parameter. The value can be specified as a string or a number. If the value is DBMS_ADVISOR.DEFAULT, the value will be reset to the default value.

Usage Notes

A parameter will only affect operations that modify the workload collection. Therefore, parameters should be set prior to importing or adding new SQL statements to a workload. If a parameter is set after data has been placed in a workload object, it will have no effect on the existing data.

Examples

BEGIN
  DBMS_ADVISOR.SET_DEFAULT_SQLWKLD_PARAMETER('VALID_TABLE_LIST','SH.%');
END;
/

SET_DEFAULT_TASK_PARAMETER Procedures

This procedure modifies the default value for a user parameter within a task or a template. A user parameter is a simple variable that stores various attributes that affect various Advisor operations. When a default value is changed for a parameter, tasks will inherit the new value when they are created.

A default task is different from a regular task. The default value is the initial value that will be inserted into a newly created task, while setting a task parameter with SET_TASK_PARAMETER sets the local value only. Thus, SET_DEFAULT_TASK_PARAMETER has no effect on an existing task.

Syntax

DBMS_ADVISOR.SET_DEFAULT_TASK_PARAMETER (
   advisor_name        IN VARCHAR2
   parameter           IN VARCHAR2,
   value               IN VARCHAR2);

DBMS_ADVISOR.SET_DEFAULT_TASK_PARAMETER (
   advisor_name        IN VARCHAR2
   parameter           IN VARCHAR2,
   value               IN NUMBER);

Parameters

Table 12-29 SET_DEFAULT_TASK_PARAMETER Procedure Parameters

Parameter Description
advisor_name Specifies the unique advisor name as defined in the view DBA_ADVISOR_DEFINITIONS.
parameter The name of the task parameter to be modified. Parameter names are not case sensitive. Parameter names are unique to the task type, but not necessarily unique to all task types. Various task types may use the same parameter name for different purposes.
value The value of the specified task parameter. The value can be specified as a string or a number.

Examples

BEGIN
  DBMS_ADVISOR.SET_DEFAULT_TASK_PARAMETER(DBMS_ADVISOR.SQLACCESS_ADVISOR,
   'VALID_TABLE_LIST', 'SH.%');
END;
/

SET_SQLWKLD_PARAMETER Procedure

This procedure modifies a user parameter within a SQL Workload object or SQL Workload object template. A user parameter is a simple variable that stores various attributes that affect workload collection, tuning decisions and reporting.

Syntax

DBMS_ADVISOR.SET_SQLWKLD_PARAMETER (
   workload_name        IN VARCHAR2,
   parameter            IN VARCHAR2,
   value                IN VARCHAR2);

DBMS_ADVISOR.SET_SQLWKLD_PARAMETER (
   workload_name        IN VARCHAR2,
   parameter            IN VARCHAR2,
   value                IN NUMBER);

Parameters

Table 12-30 SET_SQLWKLD_PARAMETER Procedure Parameters

Parameter Description
workload_name The SQL Workload object name that uniquely identifies an existing workload.
parameter The name of the data parameter to be modified. Parameter names are not case sensitive.
value The value of the specified parameter. The value can be specified as a string or a number. If the value is DBMS_ADVISOR.DEFAULT, the value will be reset to the default value.

Usage Notes

A parameter will only affect operations that modify the workload collection. Therefore, parameters should be set prior to importing or adding new SQL statements to a workload. If a parameter is set after data has been placed in a workload object, it will have no effect on the existing data.

SQL Workload Object Parameters

Table 12-31 lists SQL Access Advisor object parameters.

Table 12-31 SQL Workload Object Parameters

Name Datatype Description
ACTION_LIST STRINGLIST Use VALID_ACTION_LIST instead.

Contains a fully qualified list of actions that are eligible for saving in a workload.

An action can be any string. If an action is not quoted, it will be changed to uppercase lettering and stripped of leading and trailing spaces. An action string is not scanned for correctness.

During a workload import operation, if a SQL statements action does not match a name in the action list, it will not be stored in the workload object. An action name is case sensitive.

The possible values are:

  • single action

  • comma-delimited action list

  • ADVISOR_UNUSED

The default value is ADVISOR_UNUSED.

COMMENTED_FILTER_LIST NUMBER Use INVALID_SQLSTRING_LIST instead.

Comma-delimited list of strings. When set, SQL Access Advisor will filter out any SQL statement that contain any of the specified strings in the first 20 characters of its text.

DAYS_TO_EXPIRE NUMBER Specifies the expiration time in days for the current SQL Workload object. The value is relative to the last modification date.

Once the data expires, it will become a candidate for removal by an automatic purge operation.

The possible values are:

  • an integer in the range of 0 to 2147483647

  • ADVISOR_UNLIMITED

  • ADVISOR_UNUSED

The default value is 30.

END_TIME STRING Specifies an end time for selecting SQL statements. If the statement did not execute on or before the specified time, it will not be processed.

Each date must be in the standard Oracle form of MM-DD-YYY HH24:MI:SS, where:

  • DD is the numeric date

  • MM is the numeric month

  • YYYY is the numeric year

  • HH is the hour in 24 hour format

  • MI is the minute

  • SS is the second

INVALID_ACTION_LIST STRINGLIST Contains a fully qualified list of actions that are not eligible for saving in a workload.

An action can be any string. If an action is not quoted, it will be changed to uppercase lettering and stripped of leading and trailing spaces. An action string is not scanned for correctness.

During workload collection, if a SQL statement's action matches a name in the action list, it will not be processed by the operation. An action name is case sensitive.

Possible values are:

  • single action

  • comma-delimited action list

  • ADVISOR_UNUSED

The default value is ADVISOR_UNUSED.

INVALID_MODULE_LIST STRINGLIST Contains a fully qualified list of application modules that are not eligible when populating a SQL workload object. The list elements are comma-delimited, and quoted names are supported.

A module can be any string. If a module is not quoted, it will be changed to uppercase lettering and stripped of leading and trailing spaces. A module string is not scanned for correctness.

During workload collection, if a SQL statement's module matches a name in the list, it will not be processed by the operation. A module name is case sensitive.

The possible values are:

  • single application

  • comma-delimited module list

  • ADVISOR_UNUSED

The default value is ADVISOR_UNUSED.

INVALID_SQLSTRING_LIST
Contains a fully qualified list of text strings that are not eligible when populating a SQL workload object. The list of elements is comma-delimited, and quoted values are supported.

A SQL string can be any string. If a string is not quoted, it will be changed to uppercase lettering and stripped of leading and trailing spaces. A SQL string is not scanned for correctness.

During workload collection, if a SQL statement contains a string in the SQL string list, it will not be processed by the operation.

The possible values are:

  • single string

  • comma-delimited string list

  • ADVISOR_UNUSED

The default value is ADVISOR_UNUSED.

INVALID_TABLE_LIST TABLELIST Contains a fully qualified list of tables that are not eligible for tuning. The list elements are comma-delimited, and quoted identifiers are supported. Wildcard specifications are supported for both schemas and tables. The default value is all tables within the users scope are eligible for tuning. The supported wildcard character is %. A % wildcard matches any set of consecutive characters.

When a SQL statement is processed, it will not be accepted if any referenced table matches an entry in the invalid table list.

The valid syntax for a table reference is:

  • schema.table

  • schema

  • schema.% (equivalent to schema)

The possible values are:

  • single table reference

  • comma-delimited table reference list

  • ADVISOR_UNUSED

The default value is ADVISOR_UNUSED.

Note that SQL Access Advisor maintains an internal list of non-tunable tables regardless of the contents of the INVALID_TABLE_LIST parameter. No table that is owned by SYS, SYSTEM or any other pre-defined Oracle schema can be tuned.

INVALID_USERNAME_LIST STRINGLIST Contains a fully qualified list of usernames that are not eligible when populating a SQL workload object. The list elements are comma-delimited, and quoted names are supported.

During workload collection, if a SQL statements' username matches a name in the username list, it will not be processed by the operation. A username is not case sensitive unless it is quoted.

The possible values are:

  • single username

  • comma-delimited username list

  • ADVISOR_UNUSED

The default value is ADVISOR_UNUSED.

JOURNALING NUMBER Controls the logging of messages to the journal (USER_ADVISOR_JOURNAL view). The higher the setting, the more information is logged to the journal.

The valid settings are:

  • 0: no journal messages

  • 1: fatal error messages

  • 2: simple error messages

  • 3: non-fatal warning messages

  • 4-9: information messages (4 is the default)

MODULE_LIST STRINGLIST Use VALID_MODULE_LIST instead.

Contains a fully qualified list of application modules that are eligible for saving in a SQL Workload object. The list elements are comma-delimited, and quoted names are supported.

A module can be any string. If a module is not quoted, it will be changed to uppercase lettering and stripped of leading and trailing spaces. A module string is not scanned for correctness.

During a workload import operation, if a SQL statements application module does not match a name in the module list, it will not be stored in the workload object.

The possible values are:

  • single module

  • comma-delimited module list

  • ADVISOR_UNUSED

The default value is ADVISOR_UNUSED.

ORDER_LIST STRING Contains the primary natural order in which the SQL Access Advisor processes workload elements during the import operation.

Possible values are: BUFFER_GETS, OPTIMIZER_COST, CPU_TIME, DISK_READS, ELAPSED_TIME, EXECUTIONS, and PRIORITY.

REPORT_DATE_FORMAT
This parameter is not used.
SQL_LIMIT NUMBER Specifies the maximum number of SQL statements to be saved during a workload import operation. The SQL_LIMIT filter is applied after all other filters have been applied. For example, if only statements referencing the table foo.bar are to be accepted, the SQL_LIMIT value will be only apply to those statements.

When used in conjunction with the parameter ORDER_LIST, Access Advisor will process and save the most interesting SQL statements by ordering the statements according to the specified sort keys.

The possible values are:

  • an integer in the range of 1 to 2147483647

  • ADVISOR_UNLIMITED

  • ADVISOR_UNUSED

The default value is ADVISOR_UNUSED.

START_TIME STRING Specifies a start time for selecting SQL statements. If the statement did not execute on or before the specified time, it will not be processed.

Each date must be in the standard Oracle form of MM-DD-YYY HH24:MI:SS, where:

  • DD is the numeric date

  • MM is the numeric month

  • YYYY is the numeric year

  • HH is the hour in 24 hour format

  • MI is the minute

  • SS is the second

USERNAME_LIST STRINGLIST Use VALID_USERNAME_LIST instead.

Contains a fully qualified list of usernames that are eligible for processing in a SQL Workload object. The list elements are comma-delimited, and quoted names are supported.

During a workload import operation, if a SQL statements username does not match a name in the username list, it will not be stored in the workload object. A Username is not case sensitive unless it is quoted.

The possible values are:

  • single username

  • comma-delimited username list

  • ADVISOR_UNUSED

The default value is ADVISOR_UNUSED.

VALID_ACTION_LIST STRINGLIST Contains a fully qualified list of actions that are eligible when populating a SQL workload object. The list elements are comma-delimited, and quoted names are supported.

An action can be any string. If an action is not quoted, it will be changed to uppercase lettering and stripped of leading and trailing spaces. An action string is not scanned for correctness.

During workload collection, if a SQL statement's action does not match a name in the action list, it will not be processed by the operation. An action name is case sensitive.

The possible values are:

  • single action

  • comma-delimited action list

  • ADVISOR_UNUSED

The default value is ADVISOR_UNUSED.

VALID_MODULE_LIST STRINGLIST Contains a fully qualified list of application modules that are eligible when populating a SQL workload object. The list elements are comma-delimited, and quoted names are supported.

A module can be any string. If a module is not quoted, it will be changed to uppercase lettering and stripped of leading and trailing spaces. A module string is not scanned for correctness.

During workload collection, if a SQL statement's module does not match a name in the module list, it will not be processed by the operation. A module name is case sensitive.

The possible values are:

  • single application

  • comma-delimited module list

  • ADVISOR_UNUSED

The default value is ADVISOR_UNUSED.

VALID_SQLSTRING_LIST STRINGLIST Contains a fully qualified list of text strings that are eligible when populating a SQL workload object. The list elements are comma-delimited, and quoted values are supported.

A SQL string can be any string. If a string is not quoted, it will be changed to uppercase lettering and stripped of leading and trailing spaces. A SQL string is not scanned for correctness.

During workload collection, if a SQL statement does not contain a string in the SQL string list, it will not be processed by the operation.

The possible values are:

  • single string

  • comma-delimited string list

  • ADVISOR_UNUSED

The default value is ADVISOR_UNUSED.

VALID_TABLE_LIST TABLELIST Contains a fully qualified list of tables that are eligible for tuning. The list elements are comma-delimited, and quoted identifiers are supported. Wildcard specifications are supported for tables. The default value is all tables within the user's scope are eligible for tuning. The supported wildcard character is %. A % wildcard matches any set of consecutive characters.

When a SQL statement is processed, it will not be accepted unless at least one referenced table is specified in the valid table list. If the list is unused, then all table references within a SQL statement are considered valid.

When using the IMPORT_SQLWKLD_SCHEMA procedure, the valid_table_list parameter cannot contain wildcards such as SCO% or SCOTT.EMP%. The only form of wildcards supported is SCOTT.%, which specifies all tables in a given schema.

The valid syntax for a table reference is:

  • schema.table

  • schema

  • schema.% (equivalent to schema)

The possible values are:

  • single table reference

  • comma-delimited table reference list

  • ADVISOR_UNUSED

The default value is ADVISOR_UNUSED.

VALID_USERNAME_LIST STRINGLIST Contains a fully qualified list of usernames that are eligible when populating a SQL workload object. The list of elements is comma-delimited, and quoted names are supported.

During workload collection, if a SQL statement's username does not match a name in the username list, it will not be processed by the operation. A username is not case sensitive unless it is quoted.

The possible values are:

  • single username

  • comma-delimited username list

  • ADVISOR_UNUSED

The default value is ADVISOR_UNUSED.


Examples

DECLARE
  workload_name VARCHAR2(30);
BEGIN
  workload_name := 'My Workload';

  DBMS_ADVISOR.CREATE_SQLWKLD(workload_name, 'My Workload');
  DBMS_ADVISOR.SET_SQLWKLD_PARAMETER(workload_name, 'VALID_TABLE_LIST','SH.%');
END;
/

SET_TASK_PARAMETER Procedure

This procedure modifies a user parameter within an Advisor task or a template. A user parameter is a simple variable that stores various attributes that affect workload collection, tuning decisions and reporting.

Syntax

DBMS_ADVISOR.SET_TASK_PARAMETER (
   task_name           IN VARCHAR2
   parameter           IN VARCHAR2,
   value               IN VARCHAR2);

DBMS_ADVISOR.SET_TASK_PARAMETER (
   task_name           IN VARCHAR2
   parameter           IN VARCHAR2,
   value               IN NUMBER);

Parameters

Table 12-32 SET_TASK_PARAMETER Procedure Parameters

Parameter Description
task_name The Advisor task name that uniquely identifies an existing task.
parameter The name of the task parameter to be modified. Parameter names are not case sensitive. Parameter names are unique to the task type, but not necessarily unique to all task types. Various task types may use the same parameter name for different purposes.
value The value of the specified task parameter. The value can be specified as a string or a number. If the value is DEFAULT, the value will be reset to the default value.

Usage Notes

A task cannot be modified unless it is in its initial state. See "RESET_TASK Procedure" to set a task to its initial state. See your Advisor-specific documentation for further information on using this procedure.

SQL Access Advisor Task Parameters

Table 12-33 lists SQL Access Advisor task parameters.

Table 12-33 SQL Access Advisor Task Parameters

Parameter Datatype Description
ACTION_LIST STRINGLIST Use VALID_ACTION_LIST instead.

Contains a fully qualified list of actions that are eligible for processing in a SQL Workload object. The list elements are comma-delimited, and quoted names are supported.

An action can be any string. If an action is not quoted, it will be changed to uppercase lettering and stripped of leading and trailing spaces. An action string is not scanned for correctness.

During a task execution, if a SQL statement's action does not match a name in the action list, it will not be processed by the task. An action name is case sensitive.

The possible values are:

  • single action

  • comma-delimited action list

  • ADVISOR_UNUSED

The default value is ADVISOR_UNUSED.

COMMENTED_FILTER_LIST NUMBER Use INVALID_SQLSTRING_LIST instead.

Comma-delimited list of strings. When set, the SQL Access Advisor will filter out any SQL statement that contain any of the specified strings in the first 20 characters of its text.

CREATION_COST STRING When set to true (default), the SQL Access Advisor will weigh the cost of creation of the access structure (index or materialized view) against the frequency of the query and potential improvement in the query execution time. When set to false, the cost of creation is ignored.
DAYS_TO_EXPIRE NUMBER Specifies the expiration time in days for the current SQL Access Advisor task. The value is relative to the last modification date. Once the task expires, it will become a candidate for removal by an automatic purge operation.

Specifies the expiration time in days for the current Access Advisor task. The value is relative to the last modification date.

Once the task expires, it becomes a candidate for removal by an automatic purge operation.

The possible values are:

  • an integer in the range of 0 to 2147483647

  • ADVISOR_UNLIMITED

  • ADVISOR_UNUSED

The default value is 30.

DEF_INDEX_OWNER STRING Specifies the default owner for new index recommendations. When a script is created, this value will be used to qualify the index name.

Possible values are:

  • Existing schema name. Quoted identifiers are supported.

  • ADVISOR_UNUSED

The default value is ADVISOR_UNUSED.

DEF_INDEX_TABLESPACE STRING Specifies the default tablespace for new index recommendations. When a script is created, this value will be used to specify a tablespace clause.

Possible values are:

  • Existing tablespace name. Quoted identifiers are supported.

  • ADVISOR_UNUSED No tablespace clause will be present in the script for indexes.

The default value is ADVISOR_UNUSED.

DEF_MVIEW_OWNER STRING Specifies the default owner for new materialized view recommendations. When a script is created, this value will be used to qualify the materialized view name.

Possible values are:

  • Existing schema name. Quoted identifiers are supported.

  • ADVISOR_UNUSED

The default value is ADVISOR_UNUSED.

DEF_MVIEW_TABLESPACE STRING Specifies the default tablespace for new materialized view recommendations. When a script is created, this value will be used to specify a tablespace clause.

Possible values are

  • Existing tablespace name. Quoted identifiers are supported.

  • ADVISOR_UNUSED. No tablespace clause will be present in the script for materialized view logs.

The default value is ADVISOR_UNUSED.

DEF_MVLOG_TABLSPACE STRING Specifies the default tablespace for new materialized view log recommendations. When a script is created, this value will be used to specify a tablespace clause.

Possible values are:

  • Existing tablespace name. Quoted identifiers are supported.

  • ADVISOR_UNUSED. No tablespace clause will be present in the script for materialized view logs.

The default value is ADVISOR_UNUSED.

DML_VOLATILITY STRING When set to TRUE, the SQL Access Advisor will consider the impact of index maintenance and materialized view refresh in determining the recommendations. It will limit the access structure recommendations involving columns or tables that are frequently updated. For example, if there are too many DMLs on a column, it may favor a Btree index over a bitmap index on that column. For this process to be effective, the workload must include DML (insert/update/delete/merge/direct path inserts) statements that represent the update behavior of the application.

See the related parameter refresh_mode.

END_TIME STRING Specifies an end time for selecting SQL statements. If the statement did not execute on or before the specified time, it will not be processed.

Each date must be in the standard Oracle form of MM-DD-YYY HH24:MI:SS, where:

  • DD is the numeric date

  • MM is the numeric month

  • YYYY is the numeric year

  • HH is the hour in 24 hour format

  • MI is the minute

  • SS is the second

EVALUATION_ONLY STRING If set to TRUE, causes SQL Access Advisor to analyze the workload, but only comment on how well the current configuration is supporting it. No tuning recommendations will be generated.

Possible values are:

  • FALSE

  • TRUE

The default value is FALSE.

EXECUTION_TYPE STRINGLIST The type of recommendations that is desired. Possible values:
  • FULL All supported recommendation types will be considered.

  • INDEX_ONLY The SQL Access Advisor will only consider index solutions as recommendations.

  • MVIEW_ONLY The SQL Access Advisor will consider materialized view and materialized view log solutions as recommendations.

  • MVIEW_LOG_ONLY The SQL Access Advisor will only consider materialized view log solutions as recommendations.

The default value is FULL.

IMPLEMENT_EXIT_ON_ERROR STRING When performing an IMPLEMENT_TASK operation, this parameter will control behavior when an action fails to implement. If set to TRUE, IMPLEMENT_TASK will stop on the first unexpected error.

The possible values are:

  • TRUE

  • FALSE

The default value is TRUE.

INDEX_NAME_TEMPLATE STRING Specifies the method by which new index names are formed.

If the TASK_ID is omitted from the template, names generated by two concurrently executing SQL Access Advisor tasks may conflict and cause undesirable effects. So it is recommended that you include the TASK_ID in the template. Once formatted, the maximum size of a name is 30 characters.

Valid keywords are:

  • Any literal value up to 22 characters.

  • TABLE Causes the parent table name to be substituted into the index name. If the name is too long, it will be trimmed to fit.

  • TASK_ID Causes the current task identifier number to be inserted in hexadecimal form.

  • SEQ Causes a sequence number to be inserted in hexadecimal form. Because this number is used to guarantee uniqueness, it is a required token.

The default template is <TABLE>_IDX$$_<TASK_ID><SEQ>.

INVALID_ACTION_LIST STRINGLIST Contains a fully qualified list of actions that are not eligible for processing in a SQL workload object. The list elements are comma-delimited, and quoted names are supported.

An action can be any string. If an action is not quoted, it will be changed to uppercase lettering and stripped of leading and trailing spaces. An action string is not scanned for correctness.

During a task execution, if a SQL statement's action matches a name in the action list, it will not be processed by the task. An action name is case sensitive.

The possible values are:

  • single action

  • comma-delimited action list

  • ADVISOR_UNUSED

The default value is ADVISOR_UNUSED.

INVALID_MODULE_LIST STRINGLIST Contains a fully qualified list of modules that are not eligible for processing in a SQL workload object. The list elements are comma-delimited, and quoted names are supported.

A module can be any string. If a module is not quoted, it will be changed to uppercase lettering and stripped of leading and trailing spaces. A module string is not scanned for correctness.

During a task execution, if a SQL statement's module matches a name in the list, it will not be processed by the task. A module name is case sensitive.

The possible values are:

  • single application

  • comma-delimited module list

  • ADVISOR_UNUSED

The default value is ADVISOR_UNUSED.

INVALID_SQLSTRING_LIST STRINGLIST Contains a fully qualified list of text strings that are not eligible for processing in a SQL workload object. The list elements are comma-delimited, and quoted values are supported.

A SQL string can be any string. If a string is not quoted, it will be changed to uppercase lettering and stripped of leading and trailing spaces. A SQL string is not scanned for correctness.

During a task execution, if a SQL statement contains a string in the SQL string list, it will not be processed by the task.

The possible values are:

  • single string

  • comma-delimited string list

  • ADVISOR_UNUSED

The default value is ADVISOR_UNUSED.

INVALID_USERNAME_LIST STRINGLIST Contains a fully qualified list of usernames that are not eligible for processing in a SQL workload object. The list elements are comma-delimited, and quoted names are supported.

During a task execution, if a SQL statement's username matches a name in the username list, it will not be processed by the task. A username is not case sensitive unless it is quoted.

The possible values are:

  • single username

  • comma-delimited username list

  • ADVISOR_UNUSED

The default value is ADVISOR_UNUSED.

JOURNALING NUMBER Controls the logging of messages to the journal (USER_ADVISOR_JOURNAL view). The higher the setting, the more information is logged to the journal.

Valid settings are:

  • 0: no journal messages

  • 1: fatal error messages

  • 2: simple error messages

  • 3: non-fatal warning messages

  • 4-9: information messages (4 is the default)

MODE STRING Specifies the mode by which Access Advisor will operate during an analysis.

Valid values are:

  • LIMITED Indicates the Advisor will attempt to a quick job by limiting the search-space of candidate recommendations, and correspondingly, the results may be of a low quality.

  • COMPREHENSIVE Indicates the Advisor will search a large pool of candidates that may take long to run, but the resulting recommendations will be of the highest quality.

The default value is COMPREHENSIVE.

MODULE_LIST STRINGLIST Use VALID_MODULE_LIST instead.

Contains a fully qualified list of application modules that are eligible for processing in a SQL Workload object. The list elements are comma-delimited, and quoted names are supported.

A module can be any string. If a module is not quoted, it will be changed to uppercase lettering and stripped of leading and trailing spaces. A module string is not scanned for correctness.

During a workload import operation, if a SQL statement's application module does not match a name in the module list, it will not be stored in the workload object.

Possible values are:

  • single application

  • comma-delimited module list

  • ADVISOR_UNUSED

The default value is ADVISOR_UNUSED.

MVIEW_NAME_TEMPLATE STRING Specifies the method by which new materialized view names are formed.

If the TASK_ID is omitted from the template, names generated by two concurrently executing SQL Access Advisor tasks may conflict and cause undesirable effects. So it is recommended that you include the TASK_ID in the template.

The format is any combination of keyword tokens and literals. However, once formatted, the maximum size of a name is 30 characters.

Valid tokens are:

  • Any literal value up to 22 characters.

  • TASK_ID Causes the current task identifier number to be inserted in hexadecimal form.

  • SEQ Causes a sequence number to be inserted in hexadecimal form. Because this number is used to guarantee uniqueness, it is a required token.

The default template is: MV$$_<TASK_ID><SEQ>.

ORDER_LIST STRINGLIST Contains the primary natural order in which the Access Advisor processes workload elements during the analysis operation. To determine absolute natural order, Access Advisor sorts the workload using ORDER_LIST values. A comma must separate multiple order keys.

Possible values are:

  • BUFFER_GETS Sets the order using the SQL statement's buffer-get count value.

  • CPU_TIME Sets the order using the SQL statement's CPU time value.

  • DISK_READS Sets the order using the SQL statement's disk-read count value.

  • ELAPSED_TIME Sets the order using the SQL statement's elapsed time value.

  • EXECUTIONS Sets the order using the SQL statement's execution frequency value.

  • OPTIMIZER_COST Sets the order using the SQL statement's optimizer cost value.

  • I/O Sets the order using the SQL statement's I/O count value.

  • PRIORITY Sets the order using the user-supplied business priority value.

All values are accessed in descending order, where a high value is considered more interesting than a low value.

The default value is PRIORITY, OPTIMIZER_COST.

RECOMMEND_MV_EXACT_TEXT_MATCH STRING When considering candidate materialized views, exact text match solutions will only be included if this parameter contains TRUE.

The possible values are:

  • TRUE

  • FALSE

The default value is TRUE.

REFRESH_MODE STRING Specifies whether materialized views are refreshed ON_DEMAND or ON_COMMIT. This will be used to weigh the impact of materialized view refresh when the parameter dml_volatility is set to TRUE.

Possible values are:

  • ON_DEMAND

  • ON_COMMIT

The default value is ON_DEMAND.

REPORT_DATE_FORMAT STRING This is the default date and time formatting template. The default format is DD/MM/YYYYHH24:MI.
SHOW_RETAINS STRING Controls the display of RETAIN actions within an implementation script and the SQL Access Advisor wizard.

The possible values are:

  • TRUE

  • FALSE

The default value is TRUE.

SQL_LIMIT NUMBER Specifies the number of SQL statements to be analyzed. The SQL_LIMIT filter is applied after all other filters have been applied. For example, if only statements referencing the table foo.bar are to be accepted, the SQL_LIMIT value will be only apply to those statements.

When used in conjunction with the parameter ORDER_LIST, SQL Access Advisor will process the most interesting SQL statements by ordering the statements according to the specified sort keys.

The possible values are:

  • an integer in the range of 1 to 2147483647

  • ADVISOR_UNLIMITED

  • ADVISOR_UNUSED

The default value is ADVISOR_UNUSED.

START_TIME STRING Specifies a start time for selecting SQL statements. If the statement did not execute on or before the specified time, it will not be processed.

Each date must be in the standard Oracle form of MM-DD-YYY HH24:MI:SS, where:

  • DD is the numeric date

  • MM is the numeric month

  • YYYY is the numeric year

  • HH is the hour in 24 hour format

  • MI is the minute

  • SS is the second

STORAGE_CHANGE NUMBER Contains the amount of space adjustment that can be consumed by SQL Access Advisor recommendations. Zero or negative values are only permitted if the workload scope is marked as FULL.

When the SQL Access Advisor produces a set of recommendations, the resultant physical structures must be able to fit into the budgeted space. A space budget is computed by adding the STORAGE_CHANGE value to the space quantity currently used by existing access structures. A negative STORAGE_CHANGE value may force SQL Access Advisor to remove existing structures in order to shrink space demand.

Possible values:

  • Any valid integer including negative values, zero and positive values.

The default value is ADVISOR_UNLIMITED.

USERNAME_LIST STRINGLIST Use VALID_USERNAME_LIST instead.

Contains a fully qualified list of usernames that are eligible for processing in a workload object. The list elements are comma-delimited, and quoted names are supported.

During a task execution, if a SQL statement's username does not match a name in the username list, it will not be processed by the task. A username is not case sensitive unless it is quoted.

Possible values:

  • single username

  • comma-delimited username list

  • ADVISOR_UNUSED

The default value is ADVISOR_UNUSED.

VALID_ACTION_LIST STRINGLIST Contains a fully qualified list of actions that are eligible for processing in a SQL workload object. The list elements are comma-delimited, and quoted names are supported.

An action can be any string. If an action is not quoted, it will be changed to uppercase lettering and stripped of leading and trailing spaces. An action string is not scanned for correctness.

During a task execution, if a SQL statement's action does not match a name in the action list, it will not be processed by the task. An action name is case sensitive.

The possible values are:

  • single action

  • comma-delimited action list

  • ADVISOR_UNUSED

The default value is ADVISOR_UNUSED.

VALID_MODULE_LIST STRINGLIST Contains a fully qualified list of application modules that are eligible for processing in a SQL workload object. The list elements are comma-delimited, and quoted names are supported.

A module can be any string. If a module is not quoted, it will be changed to uppercase lettering and stripped of leading and trailing spaces. A module string is not scanned for correctness.

During a task execution, if a SQL statement's module does not match a name in the module list, it will not be processed by the task. A module name is case sensitive.

The possible values are:

  • single application

  • comma-delimited module list

  • ADVISOR_UNUSED

The default value is ADVISOR_UNUSED.

VALID_SQLSTRING_LIST STRINGLIST Contains a fully qualified list of text strings that are eligible for processing in a SQL workload object. The list elements are comma-delimited, and quoted names are supported.

A SQL string can be any string. If a string is not quoted, it will be changed to uppercase lettering and stripped of leading and trailing spaces. A SQL string is not scanned for correctness.

During a task execution, if a SQL statement does not contain string in the SQL string list, it will not be processed by the task.

The possible values are:

  • single string

  • comma-delimited string list

  • ADVISOR_UNUSED

The default value is ADVISOR_UNUSED.

VALID_TABLE_LIST TABLELIST Contains a fully qualified list of tables that are eligible for tuning. The list elements are comma-delimited, and quoted identifiers are supported. Wildcard specifications are supported for tables. The default value is all tables within the user's scope are eligible for tuning. Supported wildcard character is %. A % wildcard matches any set of consecutive characters.

When a SQL statement is processed, it will not be accepted unless at least one referenced table is specified in the valid table list. If the list is unused, then all table references within a SQL statement are considered valid.

The valid syntax for a table reference is:

  • schema.table

  • schema

  • schema.% (equivalent to schema)

  • comma-delimited action list

  • ADVISOR_UNUSED

The possible values are:

  • single table reference

  • comma-delimited reference list

  • ADVISOR_UNUSED

The default value is ADVISOR_UNUSED.

VALID_USERNAME_LIST STRINGLIST Contains a fully qualified list of usernames that are eligible for processing in a SQL workload object. The list elements are comma-delimited, and quoted names are supported.

During a task execution, if a SQL statement's username does not match a name in the username list, it will not be processed by the task. A username is not case sensitive unless it is quoted.

The possible values are:

  • single username

  • comma-delimited username list

  • ADVISOR_UNUSED

The default value is ADVISOR_UNUSED.

WORKLOAD_SCOPE STRING Describes the level of application coverage the workload represents. Possible values are FULL and PARTIAL.

FULL Should be used if the workload contains all interesting application SQL statements for the targeted tables.

PARTIAL (default) Should be used if the workload contains anything less than a full representation of the interesting application SQL statements for the targeted tables.


Segment Advisor Parameters

Table 12-35 lists the input task parameters that can be set in the Segment Advisor using the SET_TASK_PARAMETER procedure.

Table 12-34 Segment Advisor Task Parameters

Parameter Default Value Possible Values Description
MODE COMPREHENSIVE LIMITED: Analysis restricted to statistics available in Automatic Workload Repository.

COMPREHENSIVE: Comprehensive analysis based on sampling and Automatic Workload Repository statistics.

The data to use for analysis.
TIME_LIST UNLIMITED UNLIMITED The time limit for which the Advisor should run. Specified in seconds.
RECOMMEND_ALL TRUE If set to TRUE, generate recommendations on all segments specified by the user.

If set to FALSE, recommendations for only those objects that are eligible for shrink.

Whether to generate recommendations for all segments.

Examples

DECLARE
  task_id NUMBER;
  task_name VARCHAR2(30);
BEGIN
  task_name := 'My Task';

   DBMS_ADVISOR.CREATE_TASK(DBMS_ADVISOR.SQLACCESS_ADVISOR, task_id, task_name);
   DBMS_ADVISOR.SET_TASK_PARAMETER(task_name, 'VALID_TABLELIST',
      'SH.%,SCOTT.EMP');
END;
/

Undo Advisor Task Parameters

Table 12-35 lists the input task parameters that can be set in the Undo Advisor using the SET_TASK_PARAMETER procedure.

Table 12-35 Undo Advisor Task Parameters

Parameter Default Value Possible Values Description
TARGET_OBJECTS none UNDO_TBS The target object is the undo tablespace of the system.
START_SNAPSHOT none The valid snapshot numbers in the AWR repository. The starting time for the system to perform analysis using the snapshot numbers in the AWR repository.
END_SNAPSHOT none The valid snapshot numbers in the AWR repository. The ending time for the system to perform analysis using the snapshot numbers in the AWR repository.
BEGIN_TIME_SEC none Any positive integer. The number of seconds between the beginning time of the period and now. Describes a period of time for the system to perform analysis. BEGIN_TIME_SEC should be greater than END_TIME_SEC.
END_TIME_SEC none Any positive integer. The number of seconds between the ending time of the period and now. END_TIME_SEC should be less than BEGIN_TIME_SEC.

Examples

DECLARE
   tname  VARCHAR2(30);
   oid    NUMBER;
   BEGIN
     DBMS_ADVISOR.CREATE_TASK('Undo Advisor', tid, tname, 'Undo Advisor Task');
     DBMS_ADVISOR.CREATE_OBJECT(tname, 'UNDO_TBS', null, null, null, 'null', oid);
     DBMS_ADVISOR.SET_TASK_PARAMETER(tname, 'TARGET_OBJECTS', oid);
     DBMS_ADVISOR.SET_TASK_PARAMETER(tname, 'START_SNAPSHOT', 1);
     DBMS_ADVISOR.SET_TASK_PARAMETER(tname, 'END_SNAPSHOT', 2);
     DBMS_ADVISOR.EXECUTE_TASK(tname);
   END;
/

Automatic Database Diagnostic Monitor (ADDM) Task Parameters

Table 12-36 lists the input task parameters that can be set in ADDM using the SET_TASK_PARAMETER procedure.

Table 12-36 ADDM Task Parameters

Parameter Default Possible Values Description
START_SNAPSHOT none The valid snapshot numbers in the AWR repository. The starting time for the system to perform analysis using the snapshot numbers in the AWR repository.
END_SNAPSHOT none The valid snapshot numbers in the AWR repository. The ending time for the system to perform analysis using the snapshot numbers in the AWR repository.
DB_ID The current database ID. Not applicable. The database for START_SNAPSHOT and END_SNAPSHOT.
INSTANCE The current instance ID. Not applicable. The instance for START_SNAPSHOT and END_SNAPSHOT.
DBIO_EXPECTED 10 milliseconds System dependent. The average time to read the database block in microseconds.

Examples

DECLARE
   tid     NUMBER;
BEGIN
   DBMS_ADVISOR.CREATE_TASK('ADDM', tid, 'ADDM_TEST', 'my test');
   DBMS_ADVISOR.SET_TASK_PARAMETER('ADDM_TEST', 'START_SNAPSHOT', '19',
                                             -  'END_SNAPSHOT',   '26',
                                             -  'DB_ID', '155789304',
                                             -  'INSTANCE', '1');
   DBMS_ADVISOR.EXECUTE_TASK('ADDM_TEST');
END;
/

SQL Tuning Advisor Task Parameters

See the DBMS_SQLTUNE package and Oracle Database Performance Tuning Guide for more information.


TUNE_MVIEW Procedure

This procedure shows how to decompose a materialized view into two or more materialized views and to restate the materialized view in a way that is more advantageous for fast refresh and query rewrite. It also shows how to fix materialized view logs and to enable query rewrite.

Syntax

DBMS_ADVISOR.TUNE_MVIEW (
   task_name IN OUT VARCHAR2, 
   mv_create_stmt IN [CLOB | VARCHAR2]);

Parameters

Table 12-37 TUNE_MVIEW Procedure Parameters

Parameter Description
task_name The task name for looking up the results in a catalog view. If not specified, the system will generate a name and return.
mv_create_stmt The original materialized view creation statement.

See Also:

Oracle Database Performance Tuning Guide for more information about using the TUNE_MVIEW procedure

Usage Notes

Executing TUNE_MVIEW generates two sets of output results: one is for CREATE implementation and the other is for undoing the CREATE MATERIALIZED VIEW implementation. The output results are accessible through USER_TUNE_MVIEW and DBA_TUNE_MVIEW views. You can also use DBMS_ADVISOR.GET_TASK_SCRIPT and DBMS_ADVISOR.CREATE_FILE to output the TUNE_MVIEW results into a script file for later execution.

USER_TUNE_MVIEW and DBA_TUNE_MVIEW Views

These views are to get the result after executing the TUNE_MVIEW procedure.

Table 12-38 USER_TUNE_MVIEW and DBA_TUNE_MVIEW Views

Column Name Column Description
OWNER The materialized view owner's name.
TASK_NAME The task name as a key to access the set of recommendations
SCRIPT_TYPE Recommendation ID used to indicate the row is for IMPLEMENTATION or UNDO script.
ACTION_ID Action ID used as the command order number.
STATEMENT For TUNE_MVIEW output, this column represents the following statements, and includes statement properties such as REFRESH and REWRITE options:
  • CREATE MATERIALIZED VIEW LOG

  • ALTER MATERIALIZED VIEW LOG FORCE

  • [CREATE | DROP] MATERIALIZED VIEW


Examples

name VARCHAR2(30);
DBMS_ADVISOR.TUNE_MVIEW.(name, 'SELECT AVG(C1) FROM my_fact_table WHERE c10 = 7');

The following is an example to show how to use TUNE_MVIEW to optimize a CREATE MATERIALIZED VIEW statement:

NAME VARCHAR2(30) := 'my_tune_mview_task';
EXECUTE DBMS_ADVISOR.TUNE_MVIEW (name, 'CREATE MATERIALIZED VIEW MY_MV
REFRESH FAST AS SELECT C2, AVG(C1) FROM MY_FACT_TABLE WHERE C10 = 7
GROUP BY C2');

You can view the CREATE output results by querying USER_TUNE_MVIEW or DBA_TUNE_MVIEW as the following example:

SELECT * FROM USER_TUNE_MVIEW WHERE TASK_NAME='my_tune_mview_task' AND
SCRIPT_TYPE='CREATE';

Alternatively, you can save the output results in an external script file as in the following example:

CREATE DIRECTORY TUNE_RESULTS AS  ''/myscript_dir'' ; 
GRANT READ, WRITE ON DIRECTORY TUNE_RESULTS TO PUBLIC; 
EXECUTE DBMS_ADVISOR.CREATE_FILE(DBMS_ADVISOR.GET_TASK_SCRIPT('my_tune_mview_task'), -
'/homes/tune','my_tune_mview_create.sql');

The preceding statement will save the CREATE output results in /myscript_dir/my_tune_mview_create.sql.


UPDATE_OBJECT Procedure

This procedure updates an existing task object. Task objects are typically used as input data for a particular advisor. Segment advice can be generated at the object, segment, or tablespace level.

Syntax

DBMS_ADVISOR.UPDATE_OBJECT (
   task_name       IN VARCHAR2
   object_id       IN NUMBER,
   attr1           IN VARCHAR2 := NULL,
   attr2           IN VARCHAR2 := NULL,
   attr3           IN VARCHAR2 := NULL,
   attr4           IN CLOB := NULL,
   attr5           IN VARCHAR2 := NULL);

Parameters

Table 12-39 UPDATE_OBJECT Procedure Parameters

Parameter Description
task_name A valid advisor task name that uniquely identifies an existing task.
object_id The advisor-assigned object identifier.
attr1 Advisor-specific data. If set to NULL, there will be no effect on the target object.
attr2 Advisor-specific data. If set to NULL, there will be no effect on the target object.
attr3 Advisor-specific data. If set to NULL, there will be no effect on the target object.
attr4 Advisor-specific data. If set to NULL, there will be no effect on the target object.
attr5 Advisor-specific data. If set to null, there will be no effect on the target object.

The attribute parameters have different values depending upon the object type. See Oracle Database Administrator's Guide for details regarding these parameters and object types.

Usage Notes

If for the object level, advice is generated on all partitions of the object (if the object is partitioned). The advice is not cascaded to any dependent objects. If for the segment level, advice can be obtained on a single segment, such as the partition or subpartition of a table, index, or lob column. If for a tablespace level, target advice for every segment in the tablespace will be generated.

See Oracle Database Administrator's Guide for further information regarding the Segment Advisor.

Examples

DECLARE
  task_id NUMBER;
  task_name VARCHAR2(30);
  obj_id NUMBER;
BEGIN
  task_name := 'My Task';

  DBMS_ADVISOR.CREATE_TASK(DBMS_ADVISOR.SQLACCESS_ADVISOR, task_id, task_name);
  DBMS_ADVISOR.CREATE_OBJECT (task_name,'SQL',NULL,NULL,NULL,
                              'SELECT * FROM SH.SALES',obj_id);
  DBMS_ADVISOR.UPDATE_OBJECT (task_name, obj_id,NULL,NULL,NULL,
                              'SELECT count(*) FROM SH.SALES');
END;
/

UPDATE_REC_ATTRIBUTES Procedure

This procedure updates the owner, name, and tablespace for a recommendation.

Syntax

DBMS_ADVISOR.UPDATE_REC_ATTRIBUTES (
   task_name            IN VARCHAR2
   rec_id               IN NUMBER,
   action_id            IN NUMBER,
   attribute_name       IN VARCHAR2,
   value                IN VARCHAR2);

Parameters

Table 12-40 UPDATE_REC_ATTRIBUTES Procedure Parameters

Parameter Description
task_name The task name that uniquely identifies an existing task.
rec_id The Advisor-generated identifier number that is assigned to the recommendation.
action_id The Advisor-generated action identifier that is assigned to the particular command.
attribute_name Name of the attribute to be changed. The valid values are:
  • owner The new owner of the object.

  • name The new name of the object.

  • tablespace The new tablespace for the object.

value Specifies the new value for the recommendation attribute.

Usage Notes

Recommendation attributes cannot be modified unless the task has successfully executed.

Examples

DECLARE
  task_id NUMBER;
  task_name VARCHAR2(30);
  workload_name VARCHAR2(30);
  attribute VARCHAR2(100);
BEGIN
  task_name := 'My Task';
  workload_name := 'My Workload';

  DBMS_ADVISOR.CREATE_TASK(DBMS_ADVISOR.SQLACCESS_ADVISOR, task_id, task_name);
  DBMS_ADVISOR.CREATE_SQLWKLD(workload_name, 'My Workload');
  DBMS_ADVISOR.ADD_SQLWKLD_REF(task_name, workload_name);
  DBMS_ADVISOR.ADD_SQLWKLD_STATEMENT(workload_name, 'MONTHLY', 'ROLLUP',
                                     100,400,5041,103,640445,680000,2,
                                     1,SYSDATE,1,'SH','SELECT AVG(amount_sold)
                                     FROM sh.sales WHERE promo_id = 10');
  DBMS_ADVISOR.EXECUTE_TASK(task_name);

attribute := 'SH';

  DBMS_ADVISOR.UPDATE_REC_ATTRIBUTES(task_name, 1, 3, 'OWNER', attribute);
END;
/

UPDATE_SQLWKLD_ATTRIBUTES Procedure

This procedure changes various attributes of a SQL Workload object or template.

Syntax

DBMS_ADVISOR.UPDATE_SQLWKLD_ATTRIBUTES (
   workload_name        IN VARCHAR2,
   new_name             IN VARCHAR2 := NULL,
   description          IN VARCHAR2 := NULL,
   read_only            IN VARCHAR2 := NULL,
   is_template          IN VARCHAR2 := NULL,
   how_created          IN VARCHAR2 := NULL);

Parameters

Table 12-41 UPDATE_SQLWKLD_ATTRIBUTES Procedure Parameters

Parameter Description
workload_name The workload object name that uniquely identifies an existing workload.
new_name The new workload object name. If the value is NULL or contains the value ADVISOR_UNUSED, the workload will not be renamed. A task name can be up to 30 characters long.
description A new workload description. If the value is NULL or contains the value ADVISOR_UNUSED, the description will not be changed. Names can be up to 256 characters long.
read_only Set to TRUE so it cannot be changed.
is_template TRUE if workload is to be used as a template.
how_created Indicates a source application name that initiated the workload creation. If the value is NULL or contains the value ADVISOR_UNUSED, the source will not be changed.

Examples

DECLARE
  workload_name VARCHAR2(30);
BEGIN
  workload_name := 'My Workload';

  DBMS_ADVISOR.CREATE_SQLWKLD(workload_name, 'My Workload');
  DBMS_ADVISOR.ADD_SQLWKLD_STATEMENT(workload_name, 'MONTHLY', 'ROLLUP',
                                     100,400,5041,103,640445,680000,2,
                                     1,SYSDATE,1,'SH','SELECT AVG(amount_sold)
                                     FROM sh.sales WHERE promo_id = 10');
  DBMS_ADVISOR.UPDATE_SQLWKLD_ATTRIBUTES(workload_name,'New workload name');
END;
/

UPDATE_SQLWKLD_STATEMENT Procedure

This procedure updates an existing SQL statement in a specified SQL workload.

Syntax

DBMS_ADVISOR.UPDATE_SQLWKLD_STATEMENT (
   workload_name     IN VARCHAR2,
   sql_id            IN NUMBER,
   application       IN VARCHAR2 := NULL,
   action            IN VARCHAR2 := NULL,
   priority          IN NUMBER := NULL,
   username          IN VARCHAR2 := NULL);

DBMS_ADVISOR.UPDATE_SQLWKLD_STATEMENT (
   workload_name     IN VARCHAR2,
   search            IN VARCHAR2,
   updated           OUT NUMBER,
   application       IN VARCHAR2 := NULL,
   action            IN VARCHAR2 := NULL,
   priority          IN NUMBER := NULL,
   username          IN VARCHAR2 := NULL);

Parameters

Table 12-42 UPDATE_SQLWKLD_STATEMENT Procedure Parameters

Parameter Description
workload_name The SQL Workload object name that uniquely identifies an existing workload.
sql_id The Advisor-generated identifier number that is assigned to the statement. To specify all workload statements, use the constant DBMS_ADVISOR.ADVISOR_ALL.
updated Returns the number of statements changed by a searched update.
application Specifies a business application name that will be associated with the SQL statement. If the value is NULL or contains the value ADVISOR_UNUSED, then the column will not be updated in the repository.
action Specifies the application action for the statement. If the value is NULL or contains the value ADVISOR_UNUSED, then the column will not be updated in the repository.
priority The relative priority of the SQL statement. The value must be one of the following: 1 - HIGH, 2 - MEDIUM, or 3 - LOW.

If the value is NULL or contains the value ADVISOR_UNUSED, then the column will not be updated in the repository.

username The Oracle user name that executed the SQL statement. If the value is NULL or contains the value ADVISOR_UNUSED, then the column will not be updated in the repository.

Because a username is an Oracle identifier, the username value must be entered exactly like it is stored in the server. For example, if the user SCOTT is the executing user, then you must provide the user identifier SCOTT in all uppercase letters. It will not recognize the user scott as a match for SCOTT.

search Disabled.

Usage Notes

A workload cannot be modified or deleted if it is currently referenced by an active task. A task is considered active if it is not in its initial state. See "RESET_TASK Procedure" to set a task to its initial state.

Examples

DECLARE
  workload_name VARCHAR2(30);
  updated NUMBER;
  id NUMBER;
BEGIN
  workload_name := 'My Workload';

  DBMS_ADVISOR.CREATE_SQLWKLD(workload_name, 'My Workload');
  DBMS_ADVISOR.ADD_SQLWKLD_STATEMENT(workload_name, 'MONTHLY', 'ROLLUP',
                                     100,400,5041,103,640445,680000,2,
                                     1,SYSDATE,1,'SH','SELECT AVG(amount_sold)
                                     FROM sh.sales WHERE promo_id = 10');

   SELECT sql_id INTO id FROM USER_ADVISOR_SQLW_STMTS
   WHERE workload_name = 'My Workload';

  DBMS_ADVISOR.UPDATE_SQLWKLD_STATEMENT(workload_name, id);
END;
/

UPDATE_TASK_ATTRIBUTES Procedure

This procedure changes various attributes of a task or a task template.

Syntax

DBMS_ADVISOR.UPDATE_TASK_ATTRIBUTES (
   task_name          IN VARCHAR2
   new_name           IN VARCHAR2 := NULL,
   description        IN VARCHAR2 := NULL,
   read_only          IN VARCHAR2 := NULL,
   is_template        IN VARCHAR2 := NULL,
   how_created        IN VARCHAR2 := NULL);

Parameters

Table 12-43 UPDATE_TASK_ATTRIBUTES Procedure Parameters

Parameter Description
task_name The Advisor task name that uniquely identifies an existing task.
new_name The new Advisor task name. If the value is NULL or contains the value ADVISOR_UNUSED, the task will not be renamed. A task name can be up to 30 characters long.
description A new task description. If the value is NULL or contains the value ADVISOR_UNUSED, the description will not be changed. Names can be up to 256 characters long.
read_only Sets the task to read-only. Possible values are: TRUE and FALSE.

If the value is NULL or contains the value ADVISOR_UNUSED, the setting will not be changed.

is_template Marks the task as a template. Physically, there is no difference between a task and a template; however, a template cannot be executed. Possible values are: TRUE and FALSE. If the value is NULL or contains the value ADVISOR_UNUSED, the setting will not be changed.
how_created Indicates a source application name that initiated the task creation. If the value is NULL or contains the value ADVISOR_UNUSED, the source will not be changed.

Examples

DECLARE
  task_id NUMBER;
  task_name VARCHAR2(30);
BEGIN
  task_name := 'My Task';

  DBMS_ADVISOR.CREATE_TASK(DBMS_ADVISOR.SQLACCESS_ADVISOR, task_id, task_name);
  DBMS_ADVISOR.UPDATE_TASK_ATTRIBUTES(task_name,'New Task Name');
  DBMS_ADVISOR.UPDATE_TASK_ATTRIBUTES('New Task Name',NULL,'New description');
END;
/