It it a necessary to enable monitoring if we use  GATHER_SCHEMA_STATS?

It it necessary to enable monitoring if you use GATHER_SCHEMA_STATS with the GATHER AUTO or GATHER STALE options? What will happen if I donot enable monitoring and do the following:
EXEC DBMS_STATS.GATHER_SCHEMA_STATS(ownname=>'SCOTT', options=>'GATHER AUTO');
Thanks in advance,
Lily. NYC.

OPTIONS=> 'GATHER STALE'
When executing dbms_stats, statistics are first flushed from SGA and then
segments with stale stats are examined.
Oracle will gather statistics on objects which have statistics considered to
be STALE. This is done by looking at the tabmodifications views.
Answering to your question, if you didn't enable table monitoring and run gather stale option, you wont get any error. Simple, oracle doesn't collect stats, since there is no information available in tabmodifications views.
OPTIONS=>GATHER AUTO
Oracle will gather automatically statistics on objects which currently have NO
statistics (even if there have NO MONITORING) plus existing objects with STALE
statistics. GATHER AUTO (just like GATHER STALE) requires monitoring to be turned
on for the objects which have already statistics.
If monitoring is not turned on, there is no way for Oracle to know which objects become state.
Jaffar

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