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doc: mention statistics reset during crash recovery

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Takayuki Tsunakawa
This commit is contained in:
Bruce Momjian 2014-01-31 21:28:15 -05:00
parent 6afe200cee
commit 637fab6e57
1 changed files with 4 additions and 2 deletions
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doc/src/sgml/monitoring.sgml
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@ -185,9 +185,11 @@ postgres: <replaceable>user</> <replaceable>database</> <replaceable>host</> <re
<filename>pg_stat_tmp</filename> by default. <filename>pg_stat_tmp</filename> by default.
For better performance, <varname>stats_temp_directory</> can be For better performance, <varname>stats_temp_directory</> can be
pointed at a RAM-based file system, decreasing physical I/O requirements. pointed at a RAM-based file system, decreasing physical I/O requirements.
When the server shuts down, a permanent copy of the statistics When the server shuts down cleanly, a permanent copy of the statistics
data is stored in the <filename>global</filename> subdirectory, so that data is stored in the <filename>global</filename> subdirectory, so that
statistics can be retained across server restarts. statistics can be retained across server restarts. When recovery is
performed at server start (e.g. after immediate shutdown, server crash,
and point-in-time recovery), all statistics counters are reset.
</para> </para>
</sect2> </sect2>