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Fix recovery_prefetch docs. 

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>
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
<literal>off</literal> (the default), <literal>on</literal> and
<literal>try</literal>. The setting <literal>try</literal> enables
<literal>off</literal>, <literal>on</literal> and
<literal>try</literal> (the default). The setting
<literal>try</literal> enables
prefetching only if the operating system provides the
<function>posix_fadvise</function> function, which is currently used
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>
The <structname>pg_stat_recovery_prefetch</structname> view will contain
only one row. It is filled with nulls if recovery has not run or
<xref linkend="guc-recovery-prefetch"/> is not enabled. The
columns <structfield>wal_distance</structfield>,
<structfield>block_distance</structfield>
and <structfield>io_depth</structfield> show current values, and the
only one row. The columns <structfield>wal_distance</structfield>,
<structfield>block_distance</structfield> and
<structfield>io_depth</structfield> show current values, and the
other columns show cumulative counters that can be reset
with the <function>pg_stat_reset_shared</function> function.
</para>

2
doc/src/sgml/wal.sgml
View File

@ -812,7 +812,7 @@
The <xref linkend="guc-maintenance-io-concurrency"/> and
<xref linkend="guc-wal-decode-buffer-size"/> settings limit prefetching
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.
</para>
</sect1>