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Fix recovery_prefetch docs.

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Correct a typo and a couple of sentences that weren't updated to reflect
recent changes to the code.

Reported-by: Justin Pryzby <pryzby@telsasoft.com>
Discussion: https://postgr.es/m/20220407125555.GC24419%40telsasoft.com
This commit is contained in:
Thomas Munro 2022-04-08 13:28:04 +12:00
parent d6c0db1483
commit dafae9707a
3 changed files with 7 additions and 8 deletions
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5
doc/src/sgml/config.sgml
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@ -3685,8 +3685,9 @@ include_dir 'conf.d'
<para> <para>
Whether to try to prefetch blocks that are referenced in the WAL that Whether to try to prefetch blocks that are referenced in the WAL that
are not yet in the buffer pool, during recovery. Valid values are are not yet in the buffer pool, during recovery. Valid values are
<literal>off</literal> (the default), <literal>on</literal> and <literal>off</literal>, <literal>on</literal> and
<literal>try</literal>. The setting <literal>try</literal> enables <literal>try</literal> (the default). The setting
<literal>try</literal> enables
prefetching only if the operating system provides the prefetching only if the operating system provides the
<function>posix_fadvise</function> function, which is currently used <function>posix_fadvise</function> function, which is currently used
to implement prefetching. Note that some operating systems provide the to implement prefetching. Note that some operating systems provide the

8
doc/src/sgml/monitoring.sgml
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@ -3049,11 +3049,9 @@ SELECT pid, wait_event_type, wait_event FROM pg_stat_activity WHERE wait_event i
<para> <para>
The <structname>pg_stat_recovery_prefetch</structname> view will contain The <structname>pg_stat_recovery_prefetch</structname> view will contain
only one row. It is filled with nulls if recovery has not run or only one row. The columns <structfield>wal_distance</structfield>,
<xref linkend="guc-recovery-prefetch"/> is not enabled. The <structfield>block_distance</structfield> and
columns <structfield>wal_distance</structfield>, <structfield>io_depth</structfield> show current values, and the
<structfield>block_distance</structfield>
and <structfield>io_depth</structfield> show current values, and the
other columns show cumulative counters that can be reset other columns show cumulative counters that can be reset
with the <function>pg_stat_reset_shared</function> function. with the <function>pg_stat_reset_shared</function> function.
</para> </para>

2
doc/src/sgml/wal.sgml
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@ -812,7 +812,7 @@
The <xref linkend="guc-maintenance-io-concurrency"/> and The <xref linkend="guc-maintenance-io-concurrency"/> and
<xref linkend="guc-wal-decode-buffer-size"/> settings limit prefetching <xref linkend="guc-wal-decode-buffer-size"/> settings limit prefetching
concurrency and distance, respectively. By default, it is set to concurrency and distance, respectively. By default, it is set to
<literal>try</literal>, which enabled the feature on systems where <literal>try</literal>, which enables the feature on systems where
<function>posix_fadvise</function> is available. <function>posix_fadvise</function> is available.
</para> </para>
</sect1> </sect1>