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Track last time for statistics reset on databases and bgwriter

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Tracks one counter for each database, which is reset whenever
the statistics for any individual object inside the database is
reset, and one counter for the background writer.

Tomas Vondra, reviewed by Greg Smith
This commit is contained in:
Magnus Hagander
2011-02-10 15:09:35 +01:00
parent a2e61ec319
commit 4c468b37a2
8 changed files with 79 additions and 9 deletions
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29
doc/src/sgml/monitoring.sgml
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@@ -267,7 +267,7 @@ postgres: <replaceable>user</> <replaceable>database</> <replaceable>host</> <re
by backends (that is, not by the background writer), how many times
those backends had to execute their own fsync calls (normally the
background writer handles those even when the backend does its own
write), and total buffers allocated.
write), total buffers allocated, and time of last statistics reset.
</entry>
</row>
@@ -278,9 +278,9 @@ postgres: <replaceable>user</> <replaceable>database</> <replaceable>host</> <re
number of transactions committed and rolled back in that database,
total disk blocks read, total buffer hits (i.e., block
read requests avoided by finding the block already in buffer cache),
number of rows returned, fetched, inserted, updated and deleted, and
number of rows returned, fetched, inserted, updated and deleted, the
total number of queries cancelled due to conflict with recovery (on
standby servers).
standby servers), and time of last statistics reset.
</entry>
</row>
@@ -662,6 +662,19 @@ postgres: <replaceable>user</> <replaceable>database</> <replaceable>host</> <re
</entry>
</row>
<row>
<entry><literal><function>pg_stat_get_db_stat_reset_time</function>(<type>oid</type>)</literal></entry>
<entry><type>timestamptz</type></entry>
<entry>
Time of the last statistics reset for the database. Initialized to the
system time during the first connection to each database. The reset time
is updated when you call <function>pg_stat_reset</function> on the
database, as well as upon execution of
<function>pg_stat_reset_single_table_counters</function> against any
table or index in it.
</entry>
</row>
<row>
<entry><literal><function>pg_stat_get_numscans</function>(<type>oid</type>)</literal></entry>
<entry><type>bigint</type></entry>
@@ -1126,6 +1139,16 @@ postgres: <replaceable>user</> <replaceable>database</> <replaceable>host</> <re
</entry>
</row>
<row>
<entry><literal><function>pg_stat_get_bgwriter_stat_reset_time()</function></literal></entry>
<entry><type>timestamptz</type></entry>
<entry>
Time of the last statistics reset for the background writer, updated
when executing <function>pg_stat_reset_shared('bgwriter')</function>
on the database cluster.
</entry>
</row>
<row>
<entry><literal><function>pg_stat_get_buf_written_backend()</function></literal></entry>
<entry><type>bigint</type></entry>