RE: Hash join not being used

Look for the statistics and histograms on the involved tables. I hope u have'nt upgraded your database version or parameters in init.ora

Hope it helps.
Sanjeev

-----Original Message-----
From: Dan.Hubler_at_midata.com [mailto:Dan.Hubler_at_midata.com] Sent: Monday, June 26, 2000 10:16 AM
To: Multiple recipients of list ORACLE-L Subject: Hash join not being used

We have a query that is a good candidate for a hash-join operation. As a matter of fact, when we force it to use a hash-type join (with a hint), the
elapsed time of the query goes from 90 minutes to about 2 minutes.

However, we are unable to force it to use a hash-join, without using the hint.

What perplexes us is that a month ago, the query was using a hash-join on its
own, without our intervention.

Any clues as to why the optimizer would change its mind and stop using a hash-join?

-- 
Author: 
  INET: Dan.Hubler_at_midata.com

Fat City Network Services    -- (858) 538-5051  FAX: (858) 538-5051
San Diego, California        -- Public Internet access / Mailing Lists
--------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
the message BODY, include a line containing: UNSUB ORACLE-L
(or the name of mailing list you want to be removed from).  You may
also send the HELP command for other information (like subscribing).