Re: -HEAD planner issue wrt hash_joins on dbt3 ?

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Stefan Kaltenbrunner <stefan(at)kaltenbrunner(dot)cc>
Cc: PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: -HEAD planner issue wrt hash_joins on dbt3 ?
Date: 2006-09-17 19:26:56
Message-ID: 23958.1158521216@sss.pgh.pa.us
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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?

regards, tom lane

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