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Have they been analyzed recently? as if you were using histograms then if
the last two months were added after your last analyze it would think they
were fairly rare.
Cheers
Iain Nicoll
-----Original Message-----
Sent: 13 September 2001 19:11
To: Multiple recipients of list ORACLE-L
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Hi all:
I have a query, which behaves differently depending
on the input data (month/year). I have more than
15month worth of data in the database. The query
is completed under 1 minute for the first 13 month,
but for the last two months it just doesn't finish. I
have cancelled it after 36 minutes. The explain plans
are
differ in that the "quick" query uses more hash jonts,
while "slow" one utilizes more nested loops. All the
tables are analyzed. This must have something to
do with the data distribution, but what? Can anyone
shed some light onto that?
tia
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