Content-Type: multipart/mixed; boundary="------------tIksmNr6cgmVTMq8HgCMMIQe"
Message-ID: <51e93798-cd3b-4855-aaa4-78985025cd76@tantorlabs.com>
Date: Mon, 3 Mar 2025 15:55:42 +0300
MIME-Version: 1.0
User-Agent: Mozilla Thunderbird
Subject: Re: Sample rate added to pg_stat_statements
To: Sami Imseih <samimseih@gmail.com>
Cc: Alexander Korotkov <aekorotkov@gmail.com>,
 Michael Paquier <michael@paquier.xyz>,
 Greg Sabino Mullane <htamfids@gmail.com>,
 Andrey Borodin <x4mmm@yandex-team.ru>,
 Alena Rybakina <a.rybakina@postgrespro.ru>,
 pgsql-hackers <pgsql-hackers@postgresql.org>
References: <fe99e0ca-e564-480e-b865-5f0cee30bc60@tantorlabs.com>
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 <CAA5RZ0vxn_UiUkUK5SdngObLZzw40RhafB7SHydxzBw2_xjjiA@mail.gmail.com>
 <cc1beb52-3e4e-4866-8c32-a5967b98c977@tantorlabs.com>
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Content-Language: en-US
From: Ilia Evdokimov <ilya.evdokimov@tantorlabs.com>
In-Reply-To: <CAA5RZ0vOjQDC=OvUHuKMPYc8UT_peKt_yWpVaEqiP-JG2yqB9w@mail.gmail.com>
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On 20.02.2025 04:04, Sami Imseih wrote:
> In my opinion, sample rate is a better fit for pg_stat_statements,
> since the queries that
> you care about the most are usually the most frequently executed. Sampling them
> will still provide enough good data without the risk of not capturing
> statistics about
> them at all.
>
> Longer running queries will also likely be the least frequent, so they
> are already not likely
> contributing to the spinlock contention. Also, the least frequent
> queries will likely be aged
> out faster, so pg_stat_statements was never really a good candidate to
> track those anyways;
> slow query logging with log_min_duration_statement is a better way to
> ensure you capture
> the data.
>
> Maybe others may have a different opinion?
>
> --
>
> Sami


Hi everyone,

Since most people have expressed support for sampling based on frequency 
of query, I will revert the rebased patch for version v15. Also, given 
that everyone is likely busy with the higher-priority task of IN 
normalization in pg_stat_statements, I will leave the rebased v19-patch 
here and move it back to Ready for Committer, as the patch has already 
been it.

Any suggestions are welcome.

--
Best regards,
Ilia Evdokimov,
Tantor Labs LLC.

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    <p><br>
    </p>
    <div class="moz-cite-prefix">On 20.02.2025 04:04, Sami Imseih wrote:<br>
    </div>
    <blockquote type="cite"
cite="mid:CAA5RZ0vOjQDC=OvUHuKMPYc8UT_peKt_yWpVaEqiP-JG2yqB9w@mail.gmail.com"><span
      style="white-space: pre-wrap">
</span><span style="white-space: pre-wrap">
</span>
      <pre class="moz-quote-pre" wrap="">In my opinion, sample rate is a better fit for pg_stat_statements,
since the queries that
you care about the most are usually the most frequently executed. Sampling them
will still provide enough good data without the risk of not capturing
statistics about
them at all.

Longer running queries will also likely be the least frequent, so they
are already not likely
contributing to the spinlock contention. Also, the least frequent
queries will likely be aged
out faster, so pg_stat_statements was never really a good candidate to
track those anyways;
slow query logging with log_min_duration_statement is a better way to
ensure you capture
the data.

Maybe others may have a different opinion?

--

Sami
</pre>
    </blockquote>
    <p><br>
    </p>
    <p>Hi everyone,</p>
    <p>Since most people have expressed support for sampling based on
      frequency of query, I will revert the rebased patch for version
      v15. Also, given that everyone is likely busy with the
      higher-priority task of IN normalization in pg_stat_statements, I
      will leave the rebased v19-patch here and move it back to Ready
      for Committer, as the patch has already been it.</p>
    <p>Any suggestions are welcome.</p>
    <p>--<br>
      Best regards,<br>
      Ilia Evdokimov,<br>
      Tantor Labs LLC.<br>
    </p>
  </body>
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