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SQL> EXEC DBMS_RESOURCE_MANAGER_PRIVS.GRANT_SYSTEM_PRIVILEGE (GRANTEE_NAME => 'scott', PRIVILEGE_NAME => 'ADMINISTER_RESOURCE_MANAGER'); The DBMS_RESOURCE_MANAGER package has several procedures, but we ll focus on a few important ones that will let you use the package to control resource allocation among database users.

Note The following discussion of the Database Resource Manager is meant to familiarize you with the various steps involved in creating resource plans and enforcing them. The Resource Plan Wizard in the OEM toolset is really the best way to quickly create resource plans in your database once you get the hang of the various steps involved in creating and maintaining the plans.

The Parts Scheduler runs a background thread, keeping an eye on the parts list, to detect when a WorkOrder is ready for assembly. When it finds a WorkOrder that is ready, it is written to the AsapVehiclesToAssembly queue, where it will subsequently be picked up by the next workflow process, which is the VehicleAssembly component. Figure 13-16 shows the UI of the Parts Scheduling component.

Here are the steps you need to follow to start using the Database Resource Manager: 1. Create a pending area. This is the work area where you create and validate resource consumer groups, resource plans, and plan directives. 2. Create a resource consumer group. This is a grouping of users who will receive the same amount of resources. 3. Create a resource plan. This is a collection of directives that specify how Oracle should allocate resources to resource consumer groups. 4. Create a plan directive. This associates resource consumer groups with resource plans and allocates resources among resource consumer groups. 5. Validate the pending area. This process validates the resource consumer group, the resource plan, and the plan directive. 6. Submit the pending area. This creates the resource consumer group, the resource plan, and the plan directives, and makes them active. Once this is all done, you can assign users to resource consumer groups, and they ll get the resources that have been assigned to that group.

Before you can use the Database Resource Manager to allocate resources, modify an old plan, or create a new plan, you need to create what is called a pending area to validate changes before their implementation. The pending area serves as a work area for your changes. All the resource plans you ll create will be stored in the data dictionary, and the pending area is the staging area where you work with resource plans before they are implemented. Here s how you create the pending area: SQL> EXECUTE dbms_resource_manager.create_pending_area; PL/SQL procedure successfully completed. SQL> You can also clear the pending area by using the following procedure if you think you ve made errors while creating the various components of the Database Resource Manager: SQL> EXECUTE dbms_resource_manager.clear_pending_area; PL/SQL procedure successfully completed. SQL>

Figure 13-16. The UI of the Parts Scheduling component Figure 13-17 shows the wiring diagram for the Parts Scheduling system.

Once the pending area is active, you can create the resource consumer groups to which you ll allocate your users. You can assign users initially to one group and switch them to another group later, if necessary. You use three parameters to create a resource consumer group: consumer group name (CONSUMER_GROUP), a comment (COMMENT), and the method for distributing CPU resources among the resource consumer group s active sessions (CPU_MTH). There are two choices you can use for the CPU_MTH parameter the RUN_TO_COMPLETION method schedules sessions that will take the most time ahead of other, less time-intensive sessions, and the default ROUND_ROBIN method, which uses a round-robin scheduling system. The example in Listing 12-2 shows how to create three consumer groups in the database: local, regional, and national. Note that I m not using the CPU_MTH parameter, since I plan to use the default ROUND_ROBIN method. Listing 12-2. Creating the Resource Consumer Groups SQL> EXECUTE dbms_resource_manager.create_consumer_group > (consumer_group => 'local', comment => 'local councils'); PL/SQL procedure successfully completed. SQL> EXECUTE dbms_resource_manager.create_consumer_group > (consumer_group => 'regional', comment => 'regional councils'); PL/SQL procedure successfully completed. SQL> SQL> EXECUTE dbms_resource_manager.create_consumer_group > (consumer_group => 'national', comment => 'national office'); PL/SQL procedure successfully completed. SQL>