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Disable statistics with gather_stats_job


Oracle Tips by Burleson Consulting

First, learn about gather_stats_job at  using gather_stats_job

It's important to understand that there are two scheduled activities related to the collection of Oracle "statistics".  These are very different:

  • AWR statistics:  Oracle has an automatic method to collect AWR "snapshots" of data that is used to create elapsed-time performance reports. 

  • Optimizer statistics:  Oracle has an automatic job to collect statistics to help the optimizer make intelligent decisions about the best access method to fetch the desired rows.  This job is disabled with this command:

exec dbms_scheduler.disable(’SYS.GATHER_STATS_JOB’);

Oracle collects optimizer statistics for SQL via the default of autostats_target = auto.  Sadly, this is confusing because this command appears to be similar in function to this command to disable statistics collection:

SQL> exec dbms_scheduler.disable(’SYS.GATHER_STATS_JOB’);

Let's take a closer look at how to disable the automated collection of optimizer statistics.


Oracle MOSC notes that there are some DBA activities that require disabling the automatic statistics collection and provides this disable script.  As the SYS user, use the following query to check for this automatic collection job:

SELECT
   STATE
FROM
   DBA_SCHEDULER_JOBS
WHERE
   JOB_NAME = ’GATHER_STATS_JOB’;

If not disabled, use the following command to disable the job:

SQL> exec dbms_scheduler.disable(’SYS.GATHER_STATS_JOB’);


Robert Freeman has more on the gather_stats_job procedure. 

Oracle Database 10g uses a scheduled job, GATHER_STATS_JOB, to collect optimizer statistics. This job is created, and enabled automatically when you create a new Oracle database under Oracle Database 10g. To see this job, use the DBA_SCHEDULER_JOBS view as seen in this example:

SELECT
   a.job_name,
   a.enabled,
   c.window_name,
   c.schedule_name,
   c.start_date,
   c.repeat_interval
FROM
   dba_scheduler_jobs             a,
   dba_scheduler_wingroup_members b,
   dba_scheduler_windows          c
WHERE
   job_name=’GATHER_STATS_JOB’
And
   a.schedule_name=b.window_group_name
And
   b.window_name=c.window_name;

You can disable this job using the dbms_scheduler.disable procedure as seen in this example:

exec dbms_scheduler.disable(’GATHER_STATS_JOB’);

And you can enable the job using the dbms_scheduler.enable procedure as seen in this example:

exec dbms_scheduler.enable(’GATHER_STATS_JOB’);

See my related dbms_stats notes:

 


 

 

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