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Oracle10g Grid Computing with RAC
Chapter 17 -
Oracle’s Grid Integration Technologies

Resource and Plan Directives

Now, with the release of 10g, you have more options in assigning the resource groups to the sessions automatically. With the new features available in 10g, it now becomes possible to configure DRM to automatically assign the consumer groups to sessions. Creating mappings between the session attributes and consumer groups does this. It is also possible to prioritize these mappings and create precedence in the event of conflicts.

There are basically two types of session attributes that control the assignment of the resource group: login attributes and run-time attributes. The login attributes are evaluated at the time of session login, based on their appropriate resource group as assigned to the session. A session that is already up and running can be assigned to a different resource consumer group. Both these changes take place automatically. This provision of automatic mapping provides better control of resource usage and changes can be effected without the intervention of the administrators. It becomes possible to embed the directives in the application code itself. Based on the application needs, type of client program, operating system user level, and the client machine, the resource groups can be assigned and re-assigned.

There is a new procedure called set_group_mapping within the dbms_resource_manager that helps to map the session attributes to a consumer group. These attributes are of two types: login attributes and runtime attributes.

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