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You can query the DBA_RSRC_CONSUMER_GROUPS view for information about what groups currently exist in your database (before validating and submitting the pending area), as shown in Listing 12-3. Listing 12-3. Querying the DBA_RSRC_CONSUMER_GROUPS View SQL> SELECT consumer_group, status 2* FROM dba_rsrc_consumer_groups; CONSUMER_GROUP -----------------------------AUTO_TASK_CONSUMER_GROUP DEFAULT_CONSUMER_GROUP SYS_GROUP OTHER_GROUPS LOW_GROUP AUTO_TASK_CONSUMER_GROUP DEFAULT_CONSUMER_GROUP SYS_GROUP LOW_GROUP OTHER_GROUPS LOCAL REGIONAL NATIONAL 13 rows selected. SQL> STATUS ------PENDING PENDING PENDING PENDING ACTIVE ACTIVE ACTIVE ACTIVE PENDING ACTIVE PENDING PENDING PENDING

Three new groups were created in the previous section national, regional, and local but Listing 12-3 shows eight distinct consumer groups. The same query would have given you the following output before you created the three new groups in the pending area: SQL> SELECT consumer_group,status 2 FROM dba_rsrc_consumer_groups; CONSUMER_GROUP STATUS -------------------------- -----ORA$AUTOTASK_URGENT_GROUP BATCH_GROUP ORA$DIAGNOSTICS ORA$AUTOTASK_HEALTH_GROUP ORA$AUTOTASK_SQL_GROUP ORA$AUTOTASK_SPACE_GROUP ORA$AUTOTASK_STATS_GROUP ORA$AUTOTASK_MEDIUM_GROUP INTERACTIVE_GROUP OTHER_GROUPS DEFAULT_CONSUMER_GROUP SYS_GROUP LOW_GROUP AUTO_TASK_CONSUMER_GROUP 14 rows selected. SQL> The five resource consumer groups that you see in the preceding output are default groups that exist in every Oracle database: OTHER_GROUPS: This isn t really a group, because you can t assign users to it. When a resource plan is active, OTHER_GROUPS is the catchall term for all sessions that don t belong to this active resource plan. DEFAULT_CONSUMER_GROUP: If you don t assign users to any group, they will, by default, become members of the default group. SYS_GROUP and LOW_GROUP: These are part of the default plan, named system_plan, that exists in every database. BATCH_GROUP: This is a default group intended for use with batch operations. AUTO_TASK_CONSUMER_GROUP: This is a default resource consumer group used for automatically executed tasks, such as the gathering of statistics. The priority for jobs such as statistics collection will remain below jobs in the default consumer group. Oracle supplies seven default resource plans for each database, as shown by the output of the following query: SQL> SELECT plan, comments FROM dba_rsrc_plans; PLAN ------------------MIXED_WORKLOAD_PLAN ORA$AUTOTASK_SUB_PLAN COMMENTS -------------------------------------------------Example plan for a mixed workload that prioritizes interactive operations over batch operations. Default sub-plan for automated maintenance tasks. A directive to this sub-plan should be included in every top-level plan to manage the resources consumed by the automated maintenance tasks.

Figure 13-17. The wiring diagram of the Parts Scheduling system The system uses class Router to encapsulate access to the remote message queues. Router contains no business logic. When an incoming message is posted to the AsapOrders queue, Router fires an event to FormMain. The event notification is sent on a background thread and contains a WorkOrder as the payload. FormMain gives the WorkOrder to WorkerPartsList, which stores the order in a Hashtable. FormMain runs a timer with one-second ticks. On each tick, FormMain checks WorkerPartsList for new orders. If any are found, they are added to the ListView on the right side of FormMain.

ORA$AUTOTASK_HIGH_SUB_PLAN Default sub-plan for high-priority, automated maintenance tasks. This sub-plan is referenced by ORA$AUTOTASK_SUB_PLAN and should not be referenced directly. INTERNAL_PLAN Internally-used plan for disabling the resource manager. Default, basic, pre-defined plan that prioritizes SYS_GROUP operations and allocates minimal resources for automated maintenance and diagnostics operations. Plan for quiescing the database. This plan cannot be activated directly. To activate, use the quiesce command. Default plan for maintenance windows that prioritizes SYS_GROUP operations and allocates the remaining 5% to diagnostic operations and 25% to automated maintenance operations.

7 rows selected. SQL> If you query the DBA_RSRC_CONSUMER_GROUPS view after you validate the pending area, you ll see the five default groups and the three groups you just created. In Listing 12-4, you can see that the STATUS shows ACTIVE instead of PENDING for the three new resource consumer groups that I created. Listing 12-4. Listing the Resource Consumer Groups SQL> SELECT consumer_group, status FROM dba_rsrc_consumer_groups; CONSUMER_GROUP -----------------------------AUTO_TASK_CONSUMER_GROUP DEFAULT_CONSUMER_GROUP SYS_GROUP OTHER_GROUPS LOW_GROUP LOCAL REGIONAL NATIONAL 8 rows selected. SQL> STATUS -------ACTIVE ACTIVE ACTIVE ACTIVE ACTIVE ACTIVE ACTIVE ACTIVE

A resource plan contains directives that control the allocation of resources among various resource consumer groups. Resource plans enable you to set limits on resource use by specifying limits on four variables: CPU, number of active sessions, degree of parallelism, and the order in which queued sessions will execute. Let s look at the five parameters that control these resources in more detail: