Oracle automatic statistics optimizer job is not running after full import

Question

Hi All,
I did a full import in our QA database, import was successful, however GATHER_STATS_JOB is not running after sep 18 2010 though its enable and scheduled, i did query last_analyzed table to check and its confirmed that it didnt ran after sep18,2010.
Please refer below for the output
OWNER JOB_NAME ENABL STATE START_DATE END_DATE LAST_START_DATE NEXT_RUN_D
SYS GATHER_STATS_JOB TRUE SCHEDULED 18-09-2010 06:00:02
Oracle defined automatic optimizer statistics collection job
=======
SQL> select OWNER,JOB_NAME,STATUS,REQ_START_DATE,
to_char(ACTUAL_START_DATE, 'dd-mm-yyyy HH24:MI:SS') ACTUAL_START_DATE,RUN_DURATION
from dba_scheduler_job_run_details where
job_name='GATHER_STATS_JOB' order by ACTUAL_START_DATE asc; 2 3 4
OWNER JOB_NAME STATUS REQ_START_DATE ACTUAL_START_DATE
RUN_DURATION
SYS GATHER_STATS_JOB SUCCEEDED 16-09-2010 22:00:00
+000 00:00:22
SYS GATHER_STATS_JOB SUCCEEDED 17-09-2010 22:00:02
+000 00:00:18
SYS GATHER_STATS_JOB SUCCEEDED 18-09-2010 06:00:02
+000 00:00:26
What could be the reason for GATHER_STATS_JOB job not running although its set to auto
SQL> select dbms_stats.get_param('AUTOSTATS_TARGET') from dual;
DBMS_STATS.GET_PARAM('AUTOSTATS_TARGET')
AUTO
Does anybody has this kind of experience, please share
Apprecitate your responses
Regards
srh

Answer 1

?So basically you are saying is if none of the tables are changed then GATHER_STATS_JOB will not run, but i see tables are updated still the job is not running. I did >query dba_scheduler_jobs and the state of the job is true and scheduled. Please see my previous post on the output
Am i missing anything here, do i look for some parameters settings
So basically you are saying is if none of the tables are changed then GATHER_STATS_JOB will not run,GATHER_STATS_JOB will run and if there are any table in which there's a 10 percent change in data, it will gather statistics on that table. If no table data have changes less than 10 percent, it will not gather statistics.
http://download.oracle.com/docs/cd/B19306_01/server.102/b14211/stats.htm#i41282
Hope this helps.
-Anantha