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From: Kirill Gavrilov <diphantxm@gmail.com>
Date: Thu, 28 Nov 2024 22:20:42 +0300
Message-ID: <CA+E0NR6tnLDanSNwcqZM_-ReBXitAOFsoaBAZBqXYEx0Di+fwQ@mail.gmail.com>
Subject: Re: Truncate logs by max_log_size
To: Jim Jones <jim.jones@uni-muenster.de>
Cc: Kirill Reshke <reshkekirill@gmail.com>, "Andrey M. Borodin" <x4mmm@yandex-team.ru>, 
	Euler Taveira <euler@eulerto.com>, pgsql-hackers@lists.postgresql.org
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On Thu, Nov 28, 2024 at 5:23=E2=80=AFPM Jim Jones <jim.jones@uni-muenster.d=
e> wrote:

>
>
> On 25.11.24 17:52, Kirill Reshke wrote:
> > Hello! Please deliver the most recent patch version and fix the issues
> > Jim identified [0] as the current commitfest draws to a close.
> > Do not forget to include both parts of this patch (This was actually
> > developed off-list, and we are now using this on our cloud PostgreSQL
> > distribution on versions 12=E2=80=9317).
> >
> > [0]
> https://www.postgresql.org/message-id/35096a36-04d4-480b-a7cd-a2d8151fb73=
7%40uni-muenster.de
>
> In addition to these points, this feature seems to fail with queries
> containing special characters (more than one byte):
>
> With this "max_log_size"..
>
> postgres=3D# SHOW max_log_size;
>  max_log_size
> --------------
>  20
> (1 row)
>
> ... and this query ..
>
> postgres=3D# SELECT "=C3=84=C3=9C=C3=96" FROM t;
> ERROR:  relation "t" does not exist
> LINE 1: SELECT "=C3=84=C3=9C=C3=96" FROM t;
>
> .. this is the [truncated] log entry we get ..
>
> 2024-11-28 14:58:57.912 CET [2258876] ERROR:  relation "t" does not
> exist at character 19
> 2024-11-28 14:58:57.912 CET [2258876] STATEMENT:  SELECT "=C3=84=C3=9C=C3=
=96" FROM
>
> ... although the query originally had exactly 20 characters:
>
> postgres=3D# SELECT length('SELECT "=C3=84=C3=9C=C3=96" FROM t;');
>  length
> --------
>      20
> (1 row)
>
>
> postgres=3D# SELECT length('=C3=84=C3=9C=C3=96'::bytea), length('AUO'::by=
tea);
>  length | length
> --------+--------
>       6 |      3
> (1 row)
>
> If it is supposed to be like this, it should be clearly stated so in the
> docs.
>
> --
> Jim
>
>   Here is version 3 of this patch. I found another place where this
setting can be applied.
  Also added some documentation and specified that this setting truncates
queries by size in bytes.

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<div dir=3D"ltr"><div dir=3D"ltr">On Thu, Nov 28, 2024 at 5:23=E2=80=AFPM J=
im Jones &lt;<a href=3D"mailto:jim.jones@uni-muenster.de">jim.jones@uni-mue=
nster.de</a>&gt; wrote:<br></div><div class=3D"gmail_quote gmail_quote_cont=
ainer"><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;=
border-left:1px solid rgb(204,204,204);padding-left:1ex"><br>
<br>
On 25.11.24 17:52, Kirill Reshke wrote:<br>
&gt; Hello! Please deliver the most recent patch version and fix the issues=
<br>
&gt; Jim identified [0] as the current commitfest draws to a close.<br>
&gt; Do not forget to include both parts of this patch (This was actually<b=
r>
&gt; developed off-list, and we are now using this on our cloud PostgreSQL<=
br>
&gt; distribution on versions 12=E2=80=9317).<br>
&gt;<br>
&gt; [0] <a href=3D"https://www.postgresql.org/message-id/35096a36-04d4-480=
b-a7cd-a2d8151fb737%40uni-muenster.de" rel=3D"noreferrer" target=3D"_blank"=
>https://www.postgresql.org/message-id/35096a36-04d4-480b-a7cd-a2d8151fb737=
%40uni-muenster.de</a><br>
<br>
In addition to these points, this feature seems to fail with queries<br>
containing special characters (more than one byte):<br>
<br>
With this &quot;max_log_size&quot;..<br>
<br>
postgres=3D# SHOW max_log_size;<br>
=C2=A0max_log_size<br>
--------------<br>
=C2=A020<br>
(1 row)<br>
<br>
... and this query ..<br>
<br>
postgres=3D# SELECT &quot;=C3=84=C3=9C=C3=96&quot; FROM t;<br>
ERROR:=C2=A0 relation &quot;t&quot; does not exist<br>
LINE 1: SELECT &quot;=C3=84=C3=9C=C3=96&quot; FROM t;<br>
<br>
.. this is the [truncated] log entry we get ..<br>
<br>
2024-11-28 14:58:57.912 CET [2258876] ERROR:=C2=A0 relation &quot;t&quot; d=
oes not<br>
exist at character 19<br>
2024-11-28 14:58:57.912 CET [2258876] STATEMENT:=C2=A0 SELECT &quot;=C3=84=
=C3=9C=C3=96&quot; FROM<br>
<br>
... although the query originally had exactly 20 characters:<br>
<br>
postgres=3D# SELECT length(&#39;SELECT &quot;=C3=84=C3=9C=C3=96&quot; FROM =
t;&#39;);<br>
=C2=A0length<br>
--------<br>
=C2=A0=C2=A0=C2=A0=C2=A0 20<br>
(1 row)<br>
<br>
<br>
postgres=3D# SELECT length(&#39;=C3=84=C3=9C=C3=96&#39;::bytea), length(=
9;AUO&#39;::bytea);<br>
=C2=A0length | length<br>
--------+--------<br>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 6 |=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 3<br>
(1 row)<br>
<br>
If it is supposed to be like this, it should be clearly stated so in the<br=
>
docs.<br>
<br>
-- <br>
Jim<br>
<br></blockquote><div>=C2=A0 Here is version 3 of this patch. I found anoth=
er place where this setting can be applied.=C2=A0</div><div>=C2=A0 Also add=
ed some documentation and specified that this setting truncates queries by =
size in bytes.</div></div></div>

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