Export - can I use a hint or set a session level value? 2006-05-26 - By Jared Still
Some possibilities come to mind.
*) your data has changed significantly, and statistics are stale
*) your data has not changed, but statistics were run incorrectly and
confused the optimizer
*) your data has changed, statistics are current, but the data is now skewed
and the index
is no longer optimal
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