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Oracle Database 11g has two space-related advisors: Segment Advisor: This advisor allows you to perform growth-trend analyses on various database objects. This advisor also helps you perform object shrinkage, thus helping you reclaim unused space in your database. The Segment Advisor automatically runs during the maintenance window and recommends candidate objects for shrinking, as well as objects that are candidates for a reorganization operation due to issues such as excessive row chaining. Undo Advisor: This advisor bases its activities on system usage statistics, including the length of the queries as well as the rate of undo generation. The Undo Advisor facilitates Oracle s Automatic Undo Management (AUM) feature. It helps you to correctly size your undo tablespace and to correctly size the undo retention interval.
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Managing the Advisory Framework
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You can manage all aspects of the management advisory framework easily using the Database Control interface. You can also use the DBMS_ADVISOR package to create and manage tasks for each of the management advisors.
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Using the DBMS_ADVISOR Package
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You can invoke any of the management advisors through the OEM interface, using various wizards like the SQL Access Advisor Wizard, and this is my suggested way to use any of the advisors. However, there are times when you may need to invoke an advisor programmatically, in which case you can use the DBMS_ADVISOR package to manage modules in the advisory framework. The methods for creating a task, adjusting task parameters, performing the analysis, and reviewing the recommendations are common to all advisors.
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You must grant a user the ADVISOR privilege for the user to use the DBMS_ADVISOR package.
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These are the steps you must follow to use the DBMS_ADVISOR package to manage various advisors: 1. Create a task. 2. Set the task parameters. 3. Generate the recommendations. 4. Review the advisor s recommendations. I describe these steps in detail in the following sections.
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CHAPTER 18 MA NA GING AND M ONITORING THE OPERATIONA L DATABA SE
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Creating a Task
The first step in using an advisor is creating a task. A task is where the advisor stores all its recommendation-related information. You create a task using the CREATE_TASK procedure, as shown here: SQL> VARIABLE task_id NUMBER; SQL> VARIABLE task_name VARCHAR2(255); SQL> EXECUTE DBMS_ADVISOR.CREATE_TASK ('SQL Access Advisor', :task_id, :task_name);
Setting the Task Parameters
After you create a new task, the next step is to set the parameters for this task. The task parameters control the recommendation process. The parameters that you can modify belong to four groups: workload filtering, task configuration, schema attributes, and recommendation options. Here is an example showing how you can set various task parameters using the SET_TASK_ PARAMETER procedure: SQL> EXECUTE DBMS_ADVISOR.SET_TASK_PARAMETER ( 'TEST_TASK', 'VALID_TABLE_LIST', 'SH.SALES, SH.CUSTOMERS'); In this example, the VALID_TABLE_LIST parameter belongs to the workload-filtering group of parameters. You are instructing the advisor (the SQL Access Advisor) to exclude all tables from the analysis except the sales and customers tables from the SH schema. The following example uses the STORAGE_CHANGE parameter from the recommendation-options group to add 100MB of space to the recommendations: SQL> EXECUTE DBMS_ADVISOR.SET_TASK_PARAMETER('TEST_TASK', 'STORAGE_CHANGE', 100000000);
Tip
The V$ADVISOR_PROGRESS view lets you monitor the progress of advisor tasks as they execute.
Generating the Recommendations
To generate a set of recommendations by any advisor, you execute the task that you created earlier, using the EXECUTE_TASK procedure of the DBMS_ADVISOR package. The EXECUTE_TASK procedure will generate recommendations, which consist of one or more actions. For example, executing the SQL Access Advisor may provide a recommendation to create a materialized view and a materialized view log. Here s how you execute a task named TEST_TASK: SQL> EXECUTE DBMS_ADVISOR.EXECUTE_TASK('TEST_TASK');
Viewing the Recommendations
You can view the recommendations made by a certain task by using the GET_TASK_REPORT procedure. You can also use the DBA_ADVISOR_RECOMMENDATIONS view to check the recommendations related to a particular advisor task name: SQL> SELECT rec_id, rank, benefit FROM DBA_ADVISOR_RECOMMENDATIONS WHERE task_name = 'TEST_TASK';
CH A PT ER 1 8 M ANA GIN G AN D MON IT O RING TH E O PERA TI ON AL D AT AB ASE
REC_ID ---------1 2 3 4
RANK BENEFIT ---------- --------2 2754 3 1222 1 5499 4 594
In this example, the RANK column shows how the four recommendations stack up against each other. The BENEFIT column shows the decrease in the execution cost for each of the four recommendations.
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