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dbms_stats collection frequency scripts

Oracle Database Tips by Donald BurlesonSeptember 22, 2013


Question: 
I want to know to dbms_stats collection frequency.  How can you tell how often dbms_stats is run against your tables?

 

 

Answer:  With Oracle Database 10g and bwyond, the statistics_level initialization parameter functions as a global option for the table monitoring mechanism. This mechanism overrides the table level MONITORING clause. In other words, the [NO] MONITORING clauses are now obsolete. The statistics_level parameter was also available in 9i.

If the statistics_level parameter is set to BASIC, the monitoring feature is disabled. When it is set to TYPICAL (which is the default setting) or ALL, then the global table monitoring is enabled.

These changes are aimed at simplifying operations and also making them consistent with other related statistics. The modification monitoring mechanism is now enabled by default, and users of the GATHER AUTO or STALE feature of dbms_stats no longer have to enable monitoring explicitly for every table under the default settings.

While there are many ways to display the collection frequency for dbms_stats, this method will get the information from the data dictionary:

select
   job_name,
   enabled,
   repeat_interval
from

   see code depot for full script
   dba_scheduler_jobs
where
   job_name='GATHER_STATS_JOB';

select
   last_analyzed,
   count(*)
from
   dba_tables
where owner = 'XXX'

group by
   last_analyzed
order by
   last_analyzed desc;

select
   last_analyzed,
   count(*)
from

  see code depot for full script
   dba_tables
where owner = 'XXX'

group by
   last_analyzed
order by
   last_analyzed desc;

-- *****************************
prompt un-analyzed tables
-- ****************************
select
   table_name,
   last_analyzed

  see code depot for full script
from
   dba_tables
where owner = 'XXX'

where
   last_analyzed is NULL;

-- *****************************
prompt un-analyzed indexes
-- ****************************
select
   table_name,
   last_analyzed
from

  see code depot for full script
   dba_tables
where owner = 'XXX'

where
   last_analyzed is NULL;

 

   
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Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

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