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Re: Is Hash Agg being used? 7.4 seems to handle this query worse than 7.3 - Mailing list pgsql-general

From Tom Lane
Subject Re: Is Hash Agg being used? 7.4 seems to handle this query worse than 7.3
Date
Msg-id 26545.1044984116@sss.pgh.pa.us
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In response to Re: Is Hash Agg being used? 7.4 seems to handle this query worse than 7.3  (Greg Stark <gsstark@mit.edu>)
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Greg Stark <gsstark@mit.edu> writes:
> The exact same data. I just copied the data using pg_dumpall to do the upgrade
> and haven't updated either database at all since. The analyze stats should be
> pretty up-to-date but in any case should be the same for both assuming they
> get copied in the dump as well.

Uh, no, pg_dump doesn't copy pg_statistic; you must do a fresh ANALYZE
after loading the dump file.

            regards, tom lane

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