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Add stats for min, max, mean, stddev times to pg_stat_statements.

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The new fields are min_time, max_time, mean_time and stddev_time.

Based on an original patch from Mitsumasa KONDO, modified by me. Reviewed by Petr Jelínek.
This commit is contained in:
Andrew Dunstan
2015-03-27 15:43:22 -04:00
parent 8816af65e4
commit 717f709532
6 changed files with 170 additions and 7 deletions
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28
doc/src/sgml/pgstatstatements.sgml
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@ -86,6 +86,34 @@
<entry>Total time spent in the statement, in milliseconds</entry>
</row>
<row>
<entry><structfield>min_time</structfield></entry>
<entry><type>double precision</type></entry>
<entry></entry>
<entry>Minimum time spent in the statement, in milliseconds</entry>
</row>
<row>
<entry><structfield>max_time</structfield></entry>
<entry><type>double precision</type></entry>
<entry></entry>
<entry>Maximum time spent in the statement, in milliseconds</entry>
</row>
<row>
<entry><structfield>mean_time</structfield></entry>
<entry><type>double precision</type></entry>
<entry></entry>
<entry>Mean time spent in the statement, in milliseconds</entry>
</row>
<row>
<entry><structfield>stddev_time</structfield></entry>
<entry><type>double precision</type></entry>
<entry></entry>
<entry>Population standard deviation of time spent in the statement, in milliseconds</entry>
</row>
<row>
<entry><structfield>rows</structfield></entry>
<entry><type>bigint</type></entry>