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Re: [Gmod-schema] Re: performace problem after VACUUM ANALYZE

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: SLetovsky(at)aol(dot)com
Cc: cain(at)cshl(dot)org, pgsql-performance(at)postgresql(dot)org,gmod-schema(at)lists(dot)sourceforge(dot)net
Subject: Re: [Gmod-schema] Re: performace problem after VACUUM ANALYZE
Date: 2003-02-15 00:11:52
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-performance
SLetovsky(at)aol(dot)com writes:
> Am I correct in interpreting your comments as saying you believe that
> if we could lose the OR and the strand constraint PG would probably
> use the index properly?

No, I said I thought it could do it without that ;-).  But yes, you'd
have a much less fragile query if you could lose the OR condition.

Have you looked into using a UNION ALL instead of OR to merge the two
sets of results?  It sounds grotty, but might be faster...

			regards, tom lane

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