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Return NULL for checksum failures if checksums are not enabled

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Returning 0 could falsely indicate that there is no problem. NULL
correctly indicates that there is no information about potential
problems.

Also return 0 as numbackends instead of NULL for shared objects (as no
connection can be made to a shared object only).

Author: Julien Rouhaud <rjuju123@gmail.com>
Reviewed-by: Robert Treat <rob@xzilla.net>
This commit is contained in:
Magnus Hagander
2019-04-17 13:51:48 +02:00
parent 9010156445
commit 252b707bc4
4 changed files with 13 additions and 4 deletions
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6
doc/src/sgml/monitoring.sgml
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@ -2600,13 +2600,15 @@ SELECT pid, wait_event_type, wait_event FROM pg_stat_activity WHERE wait_event i
<entry><structfield>checksum_failures</structfield></entry>
<entry><type>bigint</type></entry>
<entry>Number of data page checksum failures detected in this
database</entry>
database (or on a shared object), or NULL if data checksums are not
enabled.</entry>
</row>
<row>
<entry><structfield>checksum_last_failure</structfield></entry>
<entry><type>timestamp with time zone</type></entry>
<entry>Time at which the last data page checksum failure was detected in
this database, or on a shared object.</entry>
this database (or on a shared object), or NULL if data checksums are not
enabled.</entry>
</row>
<row>
<entry><structfield>blk_read_time</structfield></entry>