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pg_stat_statements: Track time at which all statistics were last reset.

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This commit adds "stats_reset" column into the pg_stat_statements_info
view. This column indicates the time at which all statistics in the
pg_stat_statements view were last reset.

Per discussion, this commit also changes pg_stat_statements_info code
so that "dealloc" column is reset at the same time as "stats_reset" is reset,
i.e., whenever all pg_stat_statements entries are removed, for the sake
of consistency. Previously "dealloc" was reset only when
pg_stat_statements_reset(0, 0, 0) is called and was not reset when
pg_stat_statements_reset() with non-zero value argument discards all
entries. This was confusing.

Author: Naoki Nakamichi, Yuki Seino
Reviewed-by: Yuki Seino, Kyotaro Horiguchi, Li Japin, Fujii Masao
Discussion: https://postgr.es/m/c102cf3180d0ee73c1c5a0f7f8558322@oss.nttdata.com
This commit is contained in:
Fujii Masao
2020-12-18 10:49:58 +09:00
parent 00f690a239
commit 2e0fedf036
3 changed files with 53 additions and 16 deletions
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18
doc/src/sgml/pgstatstatements.sgml
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@@ -523,6 +523,16 @@
<varname>pg_stat_statements.max</varname> were observed
</para></entry>
</row>
<row>
<entry role="catalog_table_entry"><para role="column_definition">
<structfield>stats_reset</structfield> <type>timestamp with time zone</type>
</para>
<para>
Time at which all statistics in the
<structname>pg_stat_statements</structname> view were last reset.
</para></entry>
</row>
</tbody>
</tgroup>
</table>
@@ -549,9 +559,11 @@
specified, the default value <literal>0</literal>(invalid) is used for
each of them and the statistics that match with other parameters will be
reset. If no parameter is specified or all the specified parameters are
<literal>0</literal>(invalid), it will discard all statistics including
the statistics that <structname>pg_stat_statements_info</structname>
displays. By default, this function can only be executed by superusers.
<literal>0</literal>(invalid), it will discard all statistics.
If all statistics in the <filename>pg_stat_statements</filename>
view are discarded, it will also reset the statistics in the
<structname>pg_stat_statements_info</structname> view.
By default, this function can only be executed by superusers.
Access may be granted to others using <command>GRANT</command>.
</para>
</listitem>