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Allow pg_stat_statements to track WAL usage statistics.

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This commit adds three new columns in pg_stat_statements output to
display WAL usage statistics added by commit df3b181499.

This commit doesn't bump the version of pg_stat_statements as the
same is done for this release in commit 17e0328224.

Author: Kirill Bychik and Julien Rouhaud
Reviewed-by: Julien Rouhaud, Fujii Masao, Dilip Kumar and Amit Kapila
Discussion: https://postgr.es/m/CAB-hujrP8ZfUkvL5OYETipQwA=e3n7oqHFU=4ZLxWS_Cza3kQQ@mail.gmail.com
This commit is contained in:
Amit Kapila
2020-04-05 07:34:04 +05:30
parent 70de4e950c
commit 6b466bf5f2
5 changed files with 145 additions and 4 deletions
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27
doc/src/sgml/pgstatstatements.sgml
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@ -264,6 +264,33 @@
</entry>
</row>
<row>
<entry><structfield>wal_bytes</structfield></entry>
<entry><type>numeric</type></entry>
<entry></entry>
<entry>
Total amount of WAL bytes generated by the statement
</entry>
</row>
<row>
<entry><structfield>wal_records</structfield></entry>
<entry><type>bigint</type></entry>
<entry></entry>
<entry>
Total count of WAL records generated by the statement
</entry>
</row>
<row>
<entry><structfield>wal_num_fpw</structfield></entry>
<entry><type>bigint</type></entry>
<entry></entry>
<entry>
Total count of WAL full page writes generated by the statement
</entry>
</row>
</tbody>
</tgroup>
</table>