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doc: Add note about postgres_fdw.application_name.

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postgres_fdw.application_name can be any string of any length
and contain even non-ASCII characters.  However when it's passed
to and used as application_name in a foreign server, it's truncated
to less than NAMEDATALEN characters and any characters
other than printable ASCII ones in it will be replaced with question
marks. This commit adds these notes into the docs.

Author: Hayato Kuroda
Reviewed-by: Kyotaro Horiguchi, Fujii Masao
Discussion: https://postgr.es/m/TYCPR01MB5870D1E8B949DAF6D3B84E02F5F29@TYCPR01MB5870.jpnprd01.prod.outlook.com
This commit is contained in:
Fujii Masao 2021-12-16 15:18:30 +09:00
parent a13db0e164
commit 58e2e6eb67
1 changed files with 10 additions and 0 deletions
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10
doc/src/sgml/postgres-fdw.sgml
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@ -936,6 +936,16 @@ postgres=# SELECT postgres_fdw_disconnect_all();
Note that change of this parameter doesn't affect any existing
connections until they are re-established.
</para>
<para>
<varname>postgres_fdw.application_name</varname> can be any string
of any length and contain even non-ASCII characters. However when
it's passed to and used as <varname>application_name</varname>
in a foreign server, note that it will be truncated to less than
<symbol>NAMEDATALEN</symbol> characters and any characters other
than printable ASCII ones in it will be replaced with question
marks (<literal>?</literal>).
See <xref linkend="guc-application-name"/> for details.
</para>
</listitem>
</varlistentry>
</variablelist>