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Quick Question: Does dbms_stats collects stats for invisible indexes

Does dbms_stats collects statistics for invisible indexes?

The answer is yes, Although the invisible indexes does not used by optimizer but they should be ready when it needed, hence the dbms_stats collects the statistics on the invisible indexes too.

Here is small test case.

 

SQL> select to_char(last_analyzed,'YYYY-MM-DD HH24:MI:SS'), VISIBILITY  from dba_indexes where index_name='IDX_MTD';

TO_CHAR(LAST_ANALYZ VISIBILIT
------------------- ---------
2013-06-15 14:00:36 INVISIBLE

SQL>
SQL> execute dbms_stats.gather_table_stats(‘SCOTT’,,'IDX_MTD');

PL/SQL procedure successfully completed.

SQL>
SQL> select to_char(last_analyzed,'YYYY-MM-DD HH24:MI:SS'), VISIBILITY from dba_indexes where index_name='IDX_MTD';

TO_CHAR(LAST_ANALYZ VISIBILIT
------------------- ---------
2013-06-15 14:01:23 INVISIBLE

See the time stamp change , so it is.

-Thanks

Geek DBA

June 17th, 2013 | Tags: | Category: Administration

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