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Fix documentation for pg_stat_recovery_prefetch.
The table was in the wrong section and using an older type of link, as
reported by Sirisha, and also using an older table layout, as I noticed
while trying to figure out how and when it might have got out of sync.
Defect in commit 5dc0418f.
Author: sirisha chamarthi <sirichamarthi22@gmail.com>
Author: Thomas Munro <thomas.munro@gmail.com>
Discussion: https://postgr.es/m/CAKrAKeVk-LRHMdyT6x_p33eF6dCorM2jed5h_eHdRdv0reSYTA@mail.gmail.com
This commit is contained in:
Thomas Munro
parent
aeebb8bf23
commit
4533de358d
@ -336,7 +336,8 @@ postgres 27093 0.0 0.0 30096 2752 ? Ss 11:34 0:00 postgres: ser
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<row>
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<entry><structname>pg_stat_recovery_prefetch</structname><indexterm><primary>pg_stat_recovery_prefetch</primary></indexterm></entry>
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<entry>Only one row, showing statistics about blocks prefetched during recovery.
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See <xref linkend="pg-stat-recovery-prefetch-view"/> for details.
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See <link linkend="monitoring-pg-stat-recovery-prefetch">
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<structname>pg_stat_recovery_prefetch</structname></link> for details.
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</entry>
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</row>
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@ -2977,81 +2978,13 @@ SELECT pid, wait_event_type, wait_event FROM pg_stat_activity WHERE wait_event i
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</sect2>
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<sect2 id="monitoring-pg-stat-subscription">
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<title><structname>pg_stat_subscription</structname></title>
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<sect2 id="monitoring-pg-stat-recovery-prefetch">
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<title><structname>pg_stat_recovery_prefetch</structname></title>
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<indexterm>
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<primary>pg_stat_subscription</primary>
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<primary>pg_stat_recovery_prefetch</primary>
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</indexterm>
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<para>
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The <structname>pg_stat_subscription</structname> view will contain one
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row per subscription for main worker (with null PID if the worker is
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not running), and additional rows for workers handling the initial data
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copy of the subscribed tables.
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</para>
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<table id="pg-stat-recovery-prefetch-view" xreflabel="pg_stat_recovery_prefetch">
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<title><structname>pg_stat_recovery_prefetch</structname> View</title>
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<tgroup cols="3">
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<thead>
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<row>
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<entry>Column</entry>
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<entry>Type</entry>
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<entry>Description</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry><structfield>prefetch</structfield></entry>
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<entry><type>bigint</type></entry>
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<entry>Number of blocks prefetched because they were not in the buffer pool</entry>
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</row>
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<row>
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<entry><structfield>hit</structfield></entry>
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<entry><type>bigint</type></entry>
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<entry>Number of blocks not prefetched because they were already in the buffer pool</entry>
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</row>
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<row>
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<entry><structfield>skip_init</structfield></entry>
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<entry><type>bigint</type></entry>
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<entry>Number of blocks not prefetched because they would be zero-initialized</entry>
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</row>
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<row>
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<entry><structfield>skip_new</structfield></entry>
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<entry><type>bigint</type></entry>
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<entry>Number of blocks not prefetched because they didn't exist yet</entry>
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</row>
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<row>
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<entry><structfield>skip_fpw</structfield></entry>
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<entry><type>bigint</type></entry>
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<entry>Number of blocks not prefetched because a full page image was included in the WAL</entry>
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</row>
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<row>
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<entry><structfield>skip_rep</structfield></entry>
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<entry><type>bigint</type></entry>
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<entry>Number of blocks not prefetched because they were already recently prefetched</entry>
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</row>
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<row>
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<entry><structfield>wal_distance</structfield></entry>
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<entry><type>integer</type></entry>
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<entry>How many bytes ahead the prefetcher is looking</entry>
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</row>
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<row>
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<entry><structfield>block_distance</structfield></entry>
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<entry><type>integer</type></entry>
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<entry>How many blocks ahead the prefetcher is looking</entry>
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</row>
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<row>
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<entry><structfield>io_depth</structfield></entry>
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<entry><type>integer</type></entry>
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<entry>How many prefetches have been initiated but are not yet known to have completed</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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<para>
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The <structname>pg_stat_recovery_prefetch</structname> view will contain
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only one row. The columns <structfield>wal_distance</structfield>,
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@ -3061,6 +2994,132 @@ SELECT pid, wait_event_type, wait_event FROM pg_stat_activity WHERE wait_event i
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with the <function>pg_stat_reset_shared</function> function.
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</para>
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<table id="pg-stat-recovery-prefetch-view" xreflabel="pg_stat_recovery_prefetch">
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<title><structname>pg_stat_recovery_prefetch</structname> View</title>
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<tgroup cols="1">
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<thead>
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<row>
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<entry role="catalog_table_entry"><para role="column_definition">
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Column Type
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</para>
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<para>
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Description
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</para></entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry role="catalog_table_entry">
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<para role="column_definition">
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<structfield>prefetch</structfield> <type>bigint</type>
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</para>
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<para>
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Number of blocks prefetched because they were not in the buffer pool
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</para>
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</entry>
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</row>
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<row>
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<entry role="catalog_table_entry">
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<para role="column_definition">
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<structfield>hit</structfield> <type>bigint</type>
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</para>
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<para>
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Number of blocks not prefetched because they were already in the buffer pool
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</para>
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</entry>
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</row>
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<row>
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<entry role="catalog_table_entry">
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<para role="column_definition">
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<structfield>skip_init</structfield> <type>bigint</type>
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</para>
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<para>
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Number of blocks not prefetched because they would be zero-initialized
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</para>
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</entry>
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</row>
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<row>
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<entry role="catalog_table_entry">
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<para role="column_definition">
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<structfield>skip_new</structfield> <type>bigint</type>
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</para>
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<para>
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Number of blocks not prefetched because they didn't exist yet
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</para>
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</entry>
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</row>
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<row>
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<entry role="catalog_table_entry">
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<para role="column_definition">
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<structfield>skip_fpw</structfield> <type>bigint</type>
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</para>
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<para>
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Number of blocks not prefetched because a full page image was included in the WAL
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</para>
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</entry>
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</row>
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<row>
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<entry role="catalog_table_entry">
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<para role="column_definition">
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<structfield>skip_rep</structfield> <type>bigint</type>
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</para>
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<para>
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Number of blocks not prefetched because they were already recently prefetched
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</para>
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</entry>
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</row>
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<row>
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<entry role="catalog_table_entry">
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<para role="column_definition">
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<structfield>wal_distance</structfield> <type>int</type>
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</para>
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<para>
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How many bytes ahead the prefetcher is looking
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</para>
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</entry>
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</row>
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<row>
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<entry role="catalog_table_entry">
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<para role="column_definition">
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<structfield>block_distance</structfield> <type>int</type>
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</para>
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<para>
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How many blocks ahead the prefetcher is looking
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</para>
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</entry>
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</row>
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<row>
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<entry role="catalog_table_entry">
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<para role="column_definition">
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<structfield>io_depth</structfield> <type>int</type>
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</para>
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<para>
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How many prefetches have been initiated but are not yet known to have completed
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</para>
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</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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</sect2>
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<sect2 id="monitoring-pg-stat-subscription">
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<title><structname>pg_stat_subscription</structname></title>
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<indexterm>
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<primary>pg_stat_subscription</primary>
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</indexterm>
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<table id="pg-stat-subscription" xreflabel="pg_stat_subscription">
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<title><structname>pg_stat_subscription</structname> View</title>
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<tgroup cols="1">
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