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Add some instrumentation to the bgwriter, through the stats collector.

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New view pg_stat_bgwriter, and the functions required to build it.
This commit is contained in:
Magnus Hagander
2007-03-30 18:34:56 +00:00
parent f9ce21f94c
commit 335feca441
10 changed files with 349 additions and 12 deletions
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77
doc/src/sgml/monitoring.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/monitoring.sgml,v 1.47 2007/03/16 17:57:35 mha Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/monitoring.sgml,v 1.48 2007/03/30 18:34:55 mha Exp $ -->
<chapter id="monitoring">
<title>Monitoring Database Activity</title>
@ -260,6 +260,16 @@ postgres: <replaceable>user</> <replaceable>database</> <replaceable>host</> <re
</entry>
</row>
<row>
<entry><structname>pg_stat_bgwriter</></entry>
<entry>One row only, showing cluster-wide statistics from the
background writer: number of scheduled checkpoints, requested
checkpoints, buffers written by checkpoints, lru-scans and all-scans,
and the number of times the bgwriter aborted a round because it had
written too many buffers during lru-scans and all-scans.
</entry>
</row>
<row>
<entry><structname>pg_stat_database</></entry>
<entry>One row per database, showing database OID, database name,
@ -751,6 +761,71 @@ postgres: <replaceable>user</> <replaceable>database</> <replaceable>host</> <re
</entry>
</row>
<row>
<entry><literal><function>pg_stat_get_bgwriter_timed_checkpoints</function>()</literal></entry>
<entry><type>bigint</type></entry>
<entry>
The number of times the bgwriter has started timed checkpoints
(because the <varname>checkpoint_timeout</varname> time has expired).
</entry>
</row>
<row>
<entry><literal><function>pg_stat_get_bgwriter_requested_checkpoints</function>()</literal></entry>
<entry><type>bigint</type></entry>
<entry>
The number of times the bgwriter has started checkpoints based on
requests from backends because the <varname>checkpoint_segments</varname>
has been exceeded or because the CHECKPOINT command has been issued.
</entry>
</row>
<row>
<entry><literal><function>pg_stat_get_bgwriter_buf_written_checkpoints</function>()</literal></entry>
<entry><type>bigint</type></entry>
<entry>
The number of buffers written by the bgwriter during checkpoints.
</entry>
</row>
<row>
<entry><literal><function>pg_stat_get_bgwriter_buf_written_lru</function>()</literal></entry>
<entry><type>bigint</type></entry>
<entry>
The number of buffers written by the bgwriter when performing a
LRU scan of the buffer cache.
</entry>
</row>
<row>
<entry><literal><function>pg_stat_get_bgwriter_buf_written_all</function>()</literal></entry>
<entry><type>bigint</type></entry>
<entry>
The number of buffers written by the bgwriter when performing a
scan of all the buffer cache.
</entry>
</row>
<row>
<entry><literal><function>pg_stat_get_bgwriter_maxwritten_lru</function>()</literal></entry>
<entry><type>bigint</type></entry>
<entry>
The number of times the bgwriter has stopped its LRU round because
it has written more buffers than specified in the
<varname>bgwriter_lru_maxpages</varname> parameter.
</entry>
</row>
<row>
<entry><literal><function>pg_stat_get_bgwriter_maxwritten_all</function>()</literal></entry>
<entry><type>bigint</type></entry>
<entry>
The number of times the bgwriter has stopped its all-buffer round
because it has written more buffers than specified in the
<varname>bgwriter_all_maxpages</varname> parameter.
</entry>
</row>
<row>
<entry><literal><function>pg_stat_clear_snapshot</function>()</literal></entry>
<entry><type>void</type></entry>