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Oracle Concepts - Changing Resource Manager Objects

Oracle Tips by Burleson Consulting

Syntax for CREATE_PENDING_AREA Procedure:

This procedure lets you make changes to resource manager objects.

All changes to the plan schema must be done within a pending area. The pending area can be thought of as a "scratch" area for plan schema changes. The administrator creates this pending area, makes changes as necessary, possibly validates these changes, and only when the submit is completed do these changes become active.

You may, at any time while the pending area is active, view the current plan schema with your changes by selecting from the appropriate user views.

At any time, you may clear the pending area if you want to stop the current changes. You may also call the VALIDATE procedure to confirm whether the changes you has made are valid. You do not have to do your changes in a given order to maintain a consistent group of entries. These checks are also implicitly done when the pending area is submitted.

Note: Oracle allows "orphan" consumer groups (i.e., consumer groups that have no plan directives that refer to them). This is in anticipation that an administrator may want to create a consumer group that is not  currently being used, but will be used in the future. The procedure has no arguments.

DBMS_RESOURCE_MANAGER.CREATE_PENDING_AREA;

Syntax of the VALIDATE_PENDING_AREA Procedure:

The VALIDATE_PENDING_AREA procedure is used to validate the contents of a pending area before they are submitted. The procedure has no arguments.

DBMS_RESOURCE_MANAGER.VALIDATE_PENDING_AREA;

Usage Notes For the Validate and Submit Procedures:

The following rules must be adhered to, and they are checked whenever the validate or submit procedures are executed:

No plan schema may contain any loops.

All plans and consumer groups referred to by plan directives must exist.

All plans must have plan directives that refer to either plans or consumer groups.

All percentages in any given level must not add up to greater than 100 for the emphasis resource allocation method.

No plan may be deleted that is currently being used as a top plan by an active instance.

For Oracle8i, the plan directive parameter, parallel_degree_limit_p1, may only appear in plan directives that refer to consumer groups (i.e., not at subplans).

There cannot be more than 32 plan directives coming from any given plan (i.e., no plan can have more than 32 children).

There cannot be more than 32 consumer groups in any active plan schema.

Plans and consumer groups use the same namespace; therefore, no plan can have the same name as any consumer group.

There must be a plan directive for OTHER_GROUPS somewhere in any active plan schema.This ensures that a session not covered by the currently active plan is allocated resources as specified by the OTHER_GROUPS directive.

If any of the above rules are broken when checked by the VALIDATE or SUBMIT procedures, then an informative error message is returned. You may then make changes to fix the problem(s) and reissue the validate or submit procedures.

Syntax of the CLEAR_PENDING_AREA Procedure:

The CLEAR_PENDING_AREA procedure clears the pending area without submitting it, all changes or entries are lost. The procedure has no arguments.

DBMS_RESOURCE_MANAGER.CLEAR_PENDING_AREA;

Syntax of the SUBMIT_PENDING_AREA Procedure:

The SUBMIT_PENDING_AREA procedure submits the contents of the pending area. First the contents are validated and then they are stored as valid in the database. The procedure has no arguments.

DBMS_RESOURCE_MANAGER.SUBMIT_PENDING_AREA;

Syntax of the SET_INITIAL_CONSUMER_GROUP Procedure:

The SET_INITIAL_CONSUMER_GROUP procedure sets the initial consumer group to which a user will belong. The user must have been granted SWITCH_RESOURCE_GROUP permission before you attempt to run this procedure.

DBMS_RESOURCE_MANAGER.SET_INITIAL_CONSUMER_GROUP (
   user           IN VARCHAR2,
   consumer_group IN VARCHAR2);

Where:

User ? The user that is to have the resource group set.

Consumer_group ? The resource (or consumer) group to grant to the user.

Syntax of the SWITCH_CONSUMER_GROUP_FOR_SESS Procedure:

The SWITCH_RESOURCE_GROUP_FOR_SESS procedure allows an administrator to switch a user's consumer group for the duration of the current session.

DBMS_RESOURCE_MANAGER.SWITCH_CONSUMER_GROUP_FOR_SESS(
  SESSION_ID      IN NUMBER,
  SESSION_SERIAL  IN NUMBER,
  CONSUMER_GROUP  IN VARCHAR2);

Where:

session_id  - SID column from the view V$SESSION
session_serial  - SERIAL# column from the view V$SESSION
consumer_group - name of the consumer group of which to switch.

Syntax of the SWITCH_CONSUMER_GROUP_FOR_USER Procedure:

The SWITCH_CONSUMER_GROUP_FOR_USER switches a user's default consumer group to a new group. This is a permanent change.

DBMS_RESOURCE_MANAGER.SWITCH_CONSUMER_GROUP_FOR_USER (
   user           IN VARCHAR2,
   consumer_group IN VARCHAR2);

Where:

user - name of the user

consumer_group - name of the consumer group to switch to

 


This is an excerpt from the eBook "Oracle DBA made Simple".

For more details on Oracle database administration, see the "Easy Oracle Jumpstart" by Robert Freeman and Steve Karam.  It?s only $19.95 when you buy it directly from the publisher here.

 


 

 
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