From: Marc Morin <marc@sandvine.com>
To: Aaron Turner <synfinatic@gmail.com>
To: pgsql-performance@postgresql.org
Subject: Re: 10+hrs vs 15min because of just one index
Date: Sun, 12 Feb 2006 12:37:13 -0500
Message-ID: <2BCEB9A37A4D354AA276774EE13FB8C2BCC338@mailserver.sandvine.com> (raw)
We've done a lot of testing on large DB's with a lot of "inserts" and
have a few comments.
The updates are "treated" as a large "insert" as we all know from pg's
point of view.
We've run into 2 classes of problems: excessing WAL checkpoints and
affects of low correlation.
WAL log write's full 8K block for first modification, then only changes.
This can be the source of "undesireable" behaviour during large batch
inserts like this.
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To: pgsql-performance@postgresql.org
Cc: marc@sandvine.com, synfinatic@gmail.com
Subject: Re: 10+hrs vs 15min because of just one index
In-Reply-To: <2BCEB9A37A4D354AA276774EE13FB8C2BCC338@mailserver.sandvine.com>
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