Optimizer Statitics Gathering Task is not updating stale statistics

Question

Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production PL/SQL Release 11.2.0.2.0 - Production
******************** List stale statistics for Schema IGR using dbms_stats.gather_database_stats **************************
DECLARE
ObjList dbms_stats.ObjectTab;
BEGIN
dbms_stats.gather_database_stats(objlist=>ObjList, options=>'LIST STALE');
FOR i in ObjList.FIRST..ObjList.LAST
LOOP
IF ObjList(i).ownname = 'IGR' THEN
dbms_output.put_line(ObjList(i).ownname || '.' || ObjList(i).ObjName || ' ' || ObjList(i).ObjType || ' ' || ObjList(i).partname);
END IF;
END LOOP;
END;
IGR.USER_INFO TABLE 189 < --------------------- 189 Tables with stale statistics
PL/SQL procedure successfully completed.
**************************** Check date IGR Table(s) last analyzed ***********************************************
SELECT MAX(last_analyzed) last_analyzed
FROM dba_tables
WHERE owner = 'IGR'
LAST_ANALYZED
14-DEC-11
*************************** Check status of Task 'auto optimizer stats collection' **********************************
SELECT client_name, job_name, job_status, job_start_time
FROM dba_autotask_job_history
WHERE client_name = 'auto optimizer stats collection'
ORDER BY job_start_time
CLIENT_NAME JOB_NAME JOB_STATUS JOB_START_TIME
auto optimizer stats collection ORA$AT_OS_OPT_SY_11952 SUCCEEDED 12-FEB-12 10.07.23.059313 AM EUROPE/LONDON
auto optimizer stats collection ORA$AT_OS_OPT_SY_11955 SUCCEEDED 12-FEB-12 02.07.33.879238 PM EUROPE/LONDON
auto optimizer stats collection ORA$AT_OS_OPT_SY_11958 SUCCEEDED 12-FEB-12 06.07.43.783262 PM EUROPE/LONDON
auto optimizer stats collection ORA$AT_OS_OPT_SY_11961 SUCCEEDED 12-FEB-12 10.07.54.206488 PM EUROPE/LONDON
Any suggestions welcome
Thanks
Steve

Answer 1

Thank you for the feedback.
I have manually updated the statistics on a single Table successfully and the Table has been removed from the list of stale statistics. So this is further evidence the daily Task "Optimizer Statistics Gathering Task" is failing to update stale statistics.
Any further comment or suggestion welcome
Thanks
Steve
SQL> SELECT owner, table_name, last_analyzed, num_rows
FROM dba_tables
WHERE owner = 'IGR' AND table_name = 'SYSAUDIT';
OWNER TABLE_NAME LAST_ANAL NUM_ROWS
IGR SYSAUDIT 14-DEC-11 59036
1 begin
2 dbms_stats.gather_table_stats(
3 ownname=> 'IGR',
4 tabname=> 'SYSAUDIT',
5 estimate_percent=> 100,
6 cascade=> DBMS_STATS.AUTO_CASCADE,
7 degree=> null,
8 no_invalidate=> DBMS_STATS.AUTO_INVALIDATE,
9 granularity=> 'AUTO',
10 method_opt=> 'FOR ALL COLUMNS SIZE AUTO');
11* end;
PL/SQL procedure successfully completed.
SQL> /
OWNER TABLE_NAME LAST_ANAL NUM_ROWS
IGR SYSAUDIT 13-FEB-12 104970