Re: information_schema performance in Postgres 12

From: Eric Gillum <eric(at)hazel(dot)co>
To: Michael Lewis <mlewis(at)entrata(dot)com>
Cc: Adrian Klaver <adrian(dot)klaver(at)aklaver(dot)com>, pgsql-general <pgsql-general(at)postgresql(dot)org>
Subject: Re: information_schema performance in Postgres 12
Date: 2020-02-26 18:05:21
Message-ID: CAMmjdmsQLj6VjQ=Dt49HGxV51iOPCAD7XP39m3VGOpXF+y9BwA@mail.gmail.com
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Does not seem to improve if I turn off JIT.

# show jit;
on
# explain analyze SELECT tc.table_name, ...
Planning Time: 8.806 ms
Execution Time: 511.249 ms
# set jit=false;
# show jit;
off
# explain analyze SELECT tc.table_name, ...
Planning Time: 8.980 ms
Execution Time: 506.016 ms

On Wed, Feb 26, 2020 at 8:41 AM Michael Lewis <mlewis(at)entrata(dot)com> wrote:

> Have you tried with JIT turned off in PG12? The long running node
> is ProjectSet type which is related to set returning functions. If that is
> getting evaluated differently in PG12, that may be issue.
>

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