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txt Running the ADDM analysis on the specified pair of snapshots SQL> You ve seen how to get an ADDM report covering a past period, but suppose you are experiencing a performance problem at 2:40 pm, and the last snapshot is from 2 pm the next snapshot won t be taken until 3 pm, so your last ADDM report is of no use to you in this case You can create an ad hoc ADDM report by manually creating a snapshot, as shown here: SQL> EXECUTE dbms_workload_repositorycreate_snapshot(); PL/SQL procedure successfully completed..

Within a few seconds of the creation of this AWR snapshot, Oracle automatically generates an ADDM report (using the period between the snapshot you just executed and the preceding snapshot), which you can view through the OEM Database Control interface.

interface MyInterface2 +MyMethod()

The DBMS_ADVISOR package helps you manage the attributes of the ADDM, as well as perform jobs like creating tasks and retrieving ADDM reports using SQL. ADDM is part of the advisory framework in Oracle Database 11g. A non-DBA user needs the ADVISOR privilege to use the DBMS_ADVISOR package. The following are the main procedures and functions of the DBMS_ADVISOR package, and they apply not just to the ADDM, but also to all the other database advisors. In this case, of course, we are interested in how to use this package for managing ADDM. CREATE_TASK: Creates a new advisor task SET_DEFAULT_TASK: Helps you modify default values of parameters within a task DELETE_TASK: Deletes a specific task from the repository EXECUTE_TASK: Executes a specific task GET_TASK_REPORT: Displays the most recent ADDM report SET_DEFAULT_TASK_PARAMETER: Modifies a default task parameter You can get an ADDM report identical to the one we got with the addmrpt.sql script in the previous section by using the GET_TASK_REPORT procedure of the DBMS_ADVISOR package. The GET_TASK_ REPORT procedure lets you get an XML, text, or HTML report for a specified task, including an ADDM task. Here s how you get a text report: SQL> SQL> 2 3 4 5 6 7 8 9* SQL> SET LONG 1000000 SELECT dbms_advisor.get_task_report( task_name, 'TEXT', 'ALL') FROM dba_advisor_tasks WHERE task_id=( SELECT max(t.task_id) FROM dba_advisor_tasks t, dba_advisor_log l WHERE t.task_id = l.task_id AND t.advisor_name='ADDM' AND l.status= 'COMPLETED');

You can also view ADDM reports via the OEM interface, using either the Database Control or the Grid Control. Let s look at how to use the Database Control interface to get the ADDM findings. First, go the ADDM page by following these steps: 1. On the Database Control home page, click the Advisor Central link, which is under the Related Links section at the bottom of the page. 2. On the Advisor Central page, you ll see the Results section at the bottom (see Figure 17-1). The latest ADDM auto-run results (based on the two latest snapshots) are available from this page. From this page you can also get the results of any other advisors you may have run. Figure 17-1 shows the Advisor Central page with the latest ADDM report shown at the bottom of the page, in the Results section. This automatically run ADDM report was completed just after 10 a.m.

on March 26, 2005, using the most recent pair of consecutive snapshots, 3167 and 3168. Click the report name link to view the detailed ADDM report, as shown in Figure 17-2. You can also save the ADDM results to a file or print the report.

MyTarget1 +MyMethod()

Tip Note that you can also view an ADDM report straight from the Database Control home page. Simply go to the Diagnostic Summary section and click the ADDM Findings link, which is a number that shows how many ADDM findings are available for viewing. If your instance doesn t have any ADDM problem findings, this number will be 0.