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Benefits of DBMS_STATS.GATHER_SCHEMA_STATS

malhiJul 5 2011 — edited Jul 7 2011
I read or heard some time back that DBMS_STATS.GATHER_SCHEMA_STATS, if executed on regular intervals, this improves the queries execution..... but i could not understand properly.

I want to ask what are the benefits & difference between DBMS_STATS.GATHER_TABLE_STATS,DBMS_STATS.GATHER_SCHEMA_STATS,DBMS_STATS.GATHER_DATABASE_STATS AND DBMS_STATS.GATHER_SCHEMA_SYSTEM.

I mean if i execute DBMS_STATS.GATHER_SCHEMA_STATS it covers DBMS_STATS.GATHER_TABLE_STATS and so on. Is it like this or not.

I shall be very thank full for easy to understand answer.
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Locked on Aug 4 2011
Added on Jul 5 2011
#11gr2, #general-database-discussions
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