See here for basic notes on using the Oracle Resource manager.

The Oracle 11g resource manager now manages I/O, and not just CPU as it did in 10g. Also, the 11g resources manager allows you to adjust the dispatching priority associated with specific files, file types or ASM disk groups can be set.

An upgrade to 11g will enable the resource manager via setting the resource_manager_plan=default_plan, and this can cause performance issues.

The resource_manager_plan parameter is used to tell the instance which resource plan to use. Note that the default_plan IS NOT the same as a NULL resource manager plan:

alter system set resource_manager_plan = mixed_workload_plan;
alter system set resource_manager_plan=default_plan;
alter system set resource_manager_plan='';

11g resource manager mixed_workload_plan

Oracle 11g includes a new mixed_workload_plan, designed to give OLTP operations priority over batch operations. The mixed_workload_plan, contains two consumer groups (interactive_group and batch_group).

Any calls assigned to the interactive_group resource group are automatically switched to the batch_group when they exceed 60 seconds.

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