Database tuning is always ongoing effort and it never stops. Similar doing health checks are like gold mine. You never know what you will get it. From Oracle DB 10g onwards, we have a facility to generate ADDM reports which often is neglected. With growing databases under my hood, I was bit negligent reviewing performance of some least used database or those which were not coming in picture very often. I thought of automating the tuning and reviewing which may help me to efficiently monitor the database performance and keep a track of what is going on in my database.
So here is my workflow.
1. Automate the ADDM report of last day for each database.
2. Send an email report to yourself and team
3. Ask team members to have a quick look every day on these reports
4. Run tuning advisor and segment advisor and review the result
5. Take actions
Hopefully, we will rip this gold mine of data for performance tuning.
Here is the script to generate ADDM report of last day.
/* * Purpose: To generate ADDM report manually * * Author: Anjul Sahu * * History: * 25-SEP-2014 anjul initial version * */ SET LONG 1000000 SET LINES 1000 PAGES 0 SET FEEDBACK ON TIMING OFF VERIFY OFF SPOOL last_day_addm_report.txt DECLARE dbid NUMBER; bid NUMBER; eid NUMBER; db_unique_name VARCHAR2(30); host_name VARCHAR2(64); status VARCHAR2(11); starttime CHAR (5); endtime CHAR (5); output VARCHAR2 (32000); tname varchar2(50); tid number; BEGIN --starttime := '00:00'; --endtime := '23:00'; dbms_output.enable(100000); SELECT MIN (snap_id)-1, MAX (snap_id)+1 INTO bid, eid FROM dba_hist_snapshot WHERE --TO_CHAR (begin_interval_time, 'hh24:mi') >= starttime --AND TO_CHAR (end_interval_time, 'hh24:mi') <= endtime --AND TRUNC (begin_interval_time) = TRUNC (SYSDATE-1) AND TRUNC (end_interval_time) = TRUNC (SYSDATE-1); SELECT dbid, db_unique_name INTO dbid, db_unique_name FROM v$database; SELECT host_name INTO host_name FROM v$instance; DBMS_ADVISOR.CREATE_TASK('ADDM',tid,tname,'ADDM Report( ' || bid || ',' || eid || ' )'); DBMS_ADVISOR.SET_TASK_PARAMETER( tname,'START_SNAPSHOT',bid ); DBMS_ADVISOR.SET_TASK_PARAMETER( tname,'END_SNAPSHOT',eid ); DBMS_ADVISOR.EXECUTE_TASK( tname ); status := 0; while status 'COMPLETED' loop select status into status from dba_advisor_tasks where task_id = tid; dbms_lock.sleep(5); end loop; SELECT DBMS_ADVISOR.GET_TASK_REPORT( tname) INTO output FROM DUAL; DBMS_OUTPUT.PUT_LINE(output); EXCEPTION WHEN OTHERS THEN dbms_output.put_line('Error Occurred...'||SQLCODE); NULL; END; / SPOOL OFF exit