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Commit4538bd3

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doc: Add details about object "wal" in pg_stat_io
This commit adds a short description of what kind of activity is trackedin pg_stat_io for the object "wal", with a link pointing to the section"WAL configuration" that has a lot of details on the matter.This should perhaps have been added ina051e71, but things are whatthey are.Author: Bertrand Drouvot <bertranddrouvot.pg@gmail.com>Discussion:https://postgr.es/m/Z7RkQ0EfYaqqjgz/@ip-10-97-1-34.eu-west-3.compute.internal
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‎doc/src/sgml/monitoring.sgml

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@@ -2930,6 +2930,16 @@ description | Waiting for a newly initialized WAL file to reach durable storage
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writer</literal>.
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</para>
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<para>
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For the <varname>object</varname> <literal>wal</literal>,
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<varname>fsyncs</varname> and <varname>fsync_time</varname> track the
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fsync activity of WAL files done in <function>issue_xlog_fsync</function>.
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<varname>writes</varname> and <varname>write_time</varname>
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track the write activity of WAL files done in
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<function>XLogWrite</function>.
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See <xref linkend="wal-configuration"/> for more information.
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</para>
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<para>
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<structname>pg_stat_io</structname> can be used to inform database tuning.
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For example:

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