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Commit0e92519

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Improve documentation around logging_collector and use of stderr.
In backup.sgml, point out that you need to be using the logging collectorif you want to log messages from a failing archive_command script. (Thisis an oversimplification, in that it will work without the collector aslong as you're not sending postmaster stderr to /dev/null; but it seemslike a good idea to encourage use of the collector to avoid problemswith multiple processes concurrently scribbling on one file.)In config.sgml, do some wordsmithing of logging_collector discussion.Per bug #6518 from Janning Vygen
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‎doc/src/sgml/backup.sgml

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@@ -1259,9 +1259,6 @@ archive_command = 'local_backup_script.sh "%p" "%f"'
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This allows all complexity to be managed within the script, which
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can be written in a popular scripting language such as
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<application>bash</> or <application>perl</>.
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Any messages written to <literal>stderr</> from the script will appear
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in the database server log, allowing complex configurations to be
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diagnosed easily if they fail.
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</para>
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<para>
@@ -1290,6 +1287,16 @@ archive_command = 'local_backup_script.sh "%p" "%f"'
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</listitem>
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</itemizedlist>
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</para>
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<tip>
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<para>
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When using an <varname>archive_command</varname> script, it's desirable
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to enable <xref linkend="guc-logging-collector">.
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Any messages written to <systemitem>stderr</> from the script will then
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appear in the database server log, allowing complex configurations to
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be diagnosed easily if they fail.
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</para>
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</tip>
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</sect3>
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</sect2>
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