Re: -HEAD planner issue wrt hash_joins on dbt3 ?

From: Stefan Kaltenbrunner <stefan(at)kaltenbrunner(dot)cc>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: -HEAD planner issue wrt hash_joins on dbt3 ?
Date: 2006-09-17 19:39:36
Message-ID: 450DA478.9080605@kaltenbrunner.cc
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Tom Lane wrote:
> Stefan Kaltenbrunner <stefan(at)kaltenbrunner(dot)cc> writes:
>> that is the explain for the 4h+ Q9:
>> http://www.kaltenbrunner.cc/files/analyze_q9.txt
>
> The big problem there seems to be the drastic misestimation of the
> number of rows matching the p_name ~~ '%ghost%' condition. What does
> pg_stats have for the p_name column?

http://www.kaltenbrunner.cc/files/pg_stat_p_name.txt

Stefan

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