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CHAPTER 11 USER MANAGEMENT AND DATABASE SECURITY
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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 four parameters that control these resources in more detail: CPU_MTH: You use this resource allocation method to specify how you wish to allocate the CPU resource among the resource consumer groups. The default method is called EMPHASIS, and it uses percentages to allocate CPU among the various groups. The alternative method, RATIO, uses ratios instead. ACTIVE_SESS_POOL_MTH: This parameter determines the limit on the number of active session in a resource consumer group. The only method available is the ACTIVE_SESS_POOL_ABSOLUTE method, which is the default. PARALLEL_DEGREE_LIMIT_MTH: This is the parameter that determines the degree of parallelism used by a specific operation. The only option is PARALLEL_DEGREE_LIMIT_ABSOLUTE (which is the default). QUEUEING_MTH: This parameter determines the order in which queued sessions will execute. Only the default FIFO_TIMEOUT option is currently available. You can also create subplans (plans within plans), which let you subdivide resources among different users. Create your resource plan by invoking the DBMS_RESOURCE_MANAGER package again: SQL> DBMS_RESOURCE_MANAGER.CREATE_PLAN (PLAN => 'membership_plan', CPU_MTH -> 'RATIO', COMMENT => 'New Membership Recruitment'); PL/SQL procedure successfully completed. SQL>
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You now have a resource plan, but the plan still doesn t have any resource limits assigned to it. You need to create a resource plan directive to assign resources to the various resource consumer groups in the database. You can allocate resources according to the following criteria: CPU: Using the CPU method, you can allocate resources among consumer groups or subplans. You can use multiple levels of CPU resource allocation to prioritize CPU usage. For example, you could specify that level 2 gets CPU resources only if any CPU resources are left after level 1 is taken care of. Sessions: You can control the maximum number of active sessions open at any time by using the ACTIVE_SESSION_POOL parameter. You can also allow for the termination of long-running SQL queries and user sessions. Degree of parallelism: You can set a limit on the degree of parallelism during any operation. Automatic consumer group switching: You can specify that, under some conditions, the database will automatically switch sessions to another consumer group. Undo usage: You can set limits on the number of undo operations a resource consumer group can generate. The database automatically terminates SQL statements that cause the undo generated by a consumer group to exceed its undo limit. This will prevent new members of the consumer group from issuing DML statements.
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CHAPTER 11 USER MANAGEMENT AND DATABASE SECURITY
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Idle time limit: The idle-time-limit resource directive, set by using the MAX_IDLE_TIME parameter, helps you control resource use by various sessions in a busy database. You can use it to set the maximum idle time for a single session. In addition, you can also limit the amount of time a user session can block another session by setting the MAX_IDLE_BLOCKER_TIME parameter. Here s an example that shows how you can limit a session in a resource plan to a maximum idle time of 600 seconds and a maximum idle time of only 300 seconds if it happens to be blocking another session: SQL> EXECUTE dbms_resource_manager.create_plan_directive (plan => 'prod_plan', group_or_subplan => 'dss_group', comment => 'Limit idle time', max_idle_time => 900, max_idle_blocker_time => 300); In the preceding example, when a session exceeds 900 seconds (or 300 seconds if it s blocking another session), the PMON background process will automatically kill the offending session. Listing 11-5 shows how to create a plan directive using the CPU method. The plan directive assigns 70 percent of the available CPU time at the first level to the local group, and the rest, 30 percent, to the regional group. It allocates 100 percent of the CPU at the second level to the national group. Note that this example uses the default emphasis method of CPU allocation, which allocates CPU in terms of percentages. There also is an alternative allocation method called ratio, which allocates CPU resources by using ratios. Listing 11-5. Creating Plan Directives Using the CPU Method SQL> EXECUTE dbms_resource_manager.create_plan directive (plan => 'membership_plan', GROUP_OR_SUBPLAN => 'local', COMMENT => 'LOCAL GROUP',CPU_P1 => 70); PL/SQL procedure successfully completed. SQL> EXECUTE dbms_resource_manager.create_plan directive (plan => 'membership_plan', GROUP_OR_SUBPLAN => 'REGIONAL',COMMENT=> 'regional group',CPU_P1 => 30); PL/SQL procedure successfully completed. SQL> EXECUTE dbms_resource_manager.create_plan directive (plan => 'membership_plan', GROUP_OR_SUBPLAN => 'national',comment => 'national group',CPU_P2 => 100); PL/SQL procedure successfully completed. SQL>
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