Re: Performance problems - Indexes and VACUUM

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: "Josh Berkus" <josh(at)agliodbs(dot)com>
Cc: pgsql-sql(at)postgresql(dot)org
Subject: Re: Performance problems - Indexes and VACUUM
Date: 2001-10-17 14:30:33
Message-ID: 26785.1003329033@sss.pgh.pa.us
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"Josh Berkus" <josh(at)agliodbs(dot)com> writes:
> 1. INDEXES: I discovered, the hard way, a peculiar problem. If you drop
> and re-create a table within the same transaction (in a function, for
> example) the indexes do not get dropped completely.

Kinda hard to believe; even if the old indexes were still around, they
wouldn't be considered to apply to the new table. I think the problem
is something else. Can you provide a reproducible example of what
you're seeing?

> runs in about 2 seconds right after a VACUUM.
> Unfortunately, 6 hours after a VACUUM, the query bogs down.

What has been changing in the meantime?

regards, tom lane

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