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Oracle Concepts - Creating a Resource Plan

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Creating a Resource Plan

Rather than have a simple CREATE RESOURCE PLAN command, Oracle8i has a series of packages which must be run in a specific order to create a proper resource plan. All resource plans are created in a pending area before being validated and committed to the database. The requirements for a valid resource plan are outlined in the definition of the DBMS_RESOURCE_MANAGER.VALIDATE_PENDING_AREA procedure below.

Resource plans can have up to 32 levels with 32 groups per level allowing the most complex resource plan to be easily grouped. Multiple plans, sub-plans and groups can all be tied together into an application spanning CPU resource utilization rule set. This rule set is known as a set of directives. An example would be a simple 2-tier plan like that shown in Figure 1.

Figure 1 Example Resource Plan

An example of how this portioning out of CPU resources works would be to examine what happens in the plan shown in Figure 1. In figure 1 we have a top level called MASTER which can have up to 100% of the CPU if it requires it. The next level of the plan creates two sub-plans, USERS and REPORTS which will get maximums of 60 and 20 percent of the CPU respectively (we also have the required plan OTHER_GROUPS to which we have assigned 20 percent, if a user is not assigned to a specific group, they get OTHERS). Under USERS we have two groups, ONLINE_USERS and BATCH_USERS.

ONLINE_USERS gets 70 percent of USERS 60 percent or an overall percent of CPU of 42 percent while the other sub-group, BATCH_USERS gets 30 percent of the 60 percent for a total overall percent of 18.

The steps for creating a resource plan, its directives and its groups is shown in Figure 2.

One thing to notice about Figure 2 is that the last step shows several possible packages which can be run to assign or change the assignment of resource groups. The first package listed, DBMS_RESOURCE_MANAGER_PRIVS.GRANT_SWITCH_CONSUMER_GROUP must be run the first time a user is assigned to a resource group or you won't be able to assign the user to the group. After the user has been given the SWITCH_CONSUMER_GROUP system privilege you don't have to re-run the package.

Figure 2 Steps to Create a Resource Plan

Figure 3 shows the code to create the resource plan in Figure 1. Figure 4 shows the results from running the source in figure 3.

Figure 3 Script to create example resource plan

set echo on
spool test_resource_plan.doc
-- Grant system privilege to plan administrator
--
execute
dbms_resource_manager_privs.grant_system_privilege('SYSTEM','ADMINISTER_RESOURCE_MANAGER',TRUE);
--
--connect to plan administrator
--
CONNECT system/system_test@ortest1.world
--
-- Create Plan Pending Area
--
EXECUTE dbms_resource_manager.create_pending_area();
--
-- Create plan
--
execute dbms_resource_manager.create_plan('MASTER','Example Resource Plan','EMPHASIS');
execute dbms_resource_manager.create_plan('USERS','Example Resource Sub Plan','EMPHASIS');
execute dbms_resource_manager.create_plan('REPORTS','Example Resource Sub Plan','EMPHASIS');
--
--Create tiers of groups in plan
--
EXECUTE dbms_resource_manager.create_consumer_group('ONLINE_USERS','3rd level group','ROUND-ROBIN');
EXECUTE dbms_resource_manager.create_consumer_group('BATCH_USERS','3rd level group','ROUND-ROBIN');
EXECUTE dbms_resource_manager.create_consumer_group('ONLINE_REPORTS','2rd level group','ROUND-ROBIN');
EXECUTE dbms_resource_manager.create_consumer_group('BATCH_REPORTS','2rd level group','ROUND-ROBIN');
--
-- Create plan directives
--
EXECUTE dbms_resource_manager.create_plan_directive('MASTER', 'USERS',
0,60,0,0,0,0,0,0,NULL);
EXECUTE dbms_resource_manager.create_plan_directive('MASTER', 'REPORTS',
0,20,0,0,0,0,0,0,NULL);
EXECUTE dbms_resource_manager.create_plan_directive('MASTER','OTHER_GROUPS', 0,20,0,0,0,0,0,0,NULL);
EXECUTE dbms_resource_manager.create_plan_directive('USERS', 'ONLINE_USERS',
0,0,70,0,0,0,0,0,NULL);
EXECUTE dbms_resource_manager.create_plan_directive('USERS', 'BATCH_USERS',   0,0,30,0,0,0,0,0,NULL);
EXECUTE
dbms_resource_manager.create_plan_directive('REPORTS','ONLINE_REPORTS',0,0,70,0,0,0,0,0,NULL);
EXECUTE dbms_resource_manager.create_plan_directive('REPORTS','BATCH_REPORTS', 0,0,30,0,0,0,0,0,NULL);
--
-- Verify Plan
--
EXECUTE dbms_resource_manager.validate_pending_area;
--
-- Submit Plan
--
EXECUTE dbms_resource_manager.submit_pending_area;
spool off
set echo off

Notice how the script in figure 3 follows the chart in Figure 2. These are the proper steps to create a resource plan. Figure 4 shows the results from running the script in Figure 3.

Figure 4 Example run of script to create example resource plan

SQL> -- Grant system privilege to plan administrator
SQL> --
SQL> execute
dbms_resource_manager_privs.grant_system_privilege('SYSTEM','ADMINISTER_RESOURCE_MANAGER',TRUE);