Re: FYI: Load times for a largish DB in 8.2 vs. 8.3 vs. 8.4 - Mailing list pgsql-general

From Tom Lane
Subject Re: FYI: Load times for a largish DB in 8.2 vs. 8.3 vs. 8.4
Date
Msg-id 12351.1245435469@sss.pgh.pa.us
Whole thread Raw
In response to Re: FYI: Load times for a largish DB in 8.2 vs. 8.3 vs. 8.4  (Stefan Kaltenbrunner <stefan@kaltenbrunner.cc>)
List pgsql-general
Stefan Kaltenbrunner <stefan@kaltenbrunner.cc> writes:
> Tom Lane wrote:
>> If you have time to repeat the experiments, it would be interesting to
>> see what happens with consistent default_statistics_target across 8.3
>> and 8.4.

> given that this was likely a single-thread restore and therefor wal
> logged I wonder if the 206min one might be affected by the issue
> discussed here
> http://archives.postgresql.org/pgsql-hackers/2009-06/msg01133.php

It might be, but the current theory about that (ie that it's the
bulkwrite patch doing it) doesn't explain the interaction with
autovacuum on/off.  I'd still like to hear whether changing the stats
target changes Todd's results.

            regards, tom lane

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