CLUSTER also does *nothing at all* to a table unless you have chosen an index to CLUSTER on. Its not as simple as
switchingfrom VACUUM or VACUUM FULL to CLUSTER.
Does CLUSTER also REINDEX? I seem to recall reducing the size of my indexes by REINDEXing after a CLUSTER, but it was a
whileago and I could have been mistaken.
-----Original Message-----
From: pgsql-performance-owner@postgresql.org [mailto:pgsql-performance-owner@postgresql.org] On Behalf Of Kevin
Grittner
Sent: Monday, January 04, 2010 1:04 PM
To: Madison Kelly; Gary Doades
Cc: pgsql-performance@postgresql.org
Subject: Re: [PERFORM] DB is slow until DB is reloaded
Madison Kelly <linux@alteeve.com> wrote:
> I've added CLUSTER -> ANALYZE -> VACUUM to my nightly
> routine and dropped the VACUUM FULL call.
The CLUSTER is probably not going to make much difference once
you've eliminated bloat, unless your queries do a lot of searches in
the sequence of the index used. Be sure to run VACUUM ANALYZE as
one statement, not two separate steps.
-Kevin
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