From: | Karsten Hilbert <Karsten(dot)Hilbert(at)gmx(dot)net> |
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To: | "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com> |
Cc: | pgsql-general(at)lists(dot)postgresql(dot)org |
Subject: | Aw: Re: question on auto_explain |
Date: | 2023-08-03 16:53:28 |
Message-ID: | trinity-dd3b1a5a-7646-4c8d-8a15-0bd59dd5fb83-1691081608121@3c-app-gmx-bs14 |
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> On Thu, Aug 3, 2023 at 9:29 AM Karsten Hilbert <Karsten(dot)Hilbert(at)gmx(dot)net[mailto:Karsten(dot)Hilbert(at)gmx(dot)net]> wrote:
>>
>> https://www.postgresql.org/docs/current/auto-explain.html[https://www.postgresql.org/docs/current/auto-explain.html]
>>
>> don't explicitely state that it does so, too. Nor can I read impliciteness that
>> "normal" EXPLAIN is *run* by auto_explain.
>
> auto_explain automatically produces the explain output of a query that is running for reals. The effect is identical to running explain analyze except your output > here is whatever the query would produce instead of the explain output, which instead goes into the log.
Thanks David. I take this to mean that auto_explain produces the same side-effects as manually running "explain analyze" does.
Would this warrant a documentation patch ? Like so:
auto_explain.log_analyze causes EXPLAIN ANALYZE output, rather than just EXPLAIN output, to be printed when an execution plan is logged. Hence
the same caveats apply for INSERT/UPDATE/DELETE queries.
Also, doesn't this makes auto_explain.log_analyze = TRUE rather surprising as it
can make any INSERT/UPDATE/DELETE fail when it is slow for some reason ...
Thanks,
Karsten
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