A previous DBA set up all our stats analyzation jobs to be of the form.
BEGIN DBMS_STATS.GATHER_SCHEMA_STATS(ownname => 'FRED', estimate_percent =>
DBMS_STATS.AUTO_SAMPLE_SIZE, cascade => TRUE ); END;
But for every table I can see, the SAMPLE_SIZE is the same as NUM_ROWS, which
is the same as the actual number of rows in the table.
I read somewhere that actual value of AUTO_SAMPLE_SIZE can vary from release to
release (and patch to patch), but why on earth would it always be every row in
the table?
I'm getting ready to change the estimate percentage to something more
reasonable. Just wondering if there is something I'm missing somewhere that is
influencing this behavior.
Matt
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