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doc: Mention possible ephemeral discrepancies in pg_stat_activity

author Michael Paquier <michael@paquier.xyz>

2025年3月26日 23:07:54 +0000 (08:07 +0900)

committer Michael Paquier <michael@paquier.xyz>

2025年3月26日 23:07:54 +0000 (08:07 +0900)

Ephemeral inconsistencies across multiple attributes of pg_stat_activity
can exist as the system is designed to be efficient with a low overhead.
This question is raised by users from time to time based on the data
read in the view, so let's add a note in the docs about this
possibility.

Author: Alex Friedman <alexf01@gmail.com>
Reviewed-by: Sami Imseih <samimseih@gmail.com>
Discussion: https://postgr.es/m/8a275154-a654-44b0-ab37-197802f04c7b@gmail.com

doc/src/sgml/monitoring.sgml patch | blob | blame | history

diff --git a/doc/src/sgml/monitoring.sgml b/doc/src/sgml/monitoring.sgml

index 0960f5ba94a8eafc153e85efb2fe56ca4a0d4119..bacc09cb8afae095a41df85a1f03a86d8572f56b 100644 (file)

--- a/doc/src/sgml/monitoring.sgml

+++ b/doc/src/sgml/monitoring.sgml

@@ -1022,7 +1022,9 @@ postgres 27093 0.0 0.0 30096 2752 ? Ss 11:34 0:00 postgres: ser

it may or may not be <literal>waiting</literal> on some event. If the state

is <literal>active</literal> and <structfield>wait_event</structfield> is non-null, it

means that a query is being executed, but is being blocked somewhere

- in the system.

+ in the system. To keep the reporting overhead low, the system does not

+ attempt to synchronize different aspects of activity data for a backend.

+ As a result, ephemeral discrepancies may exist between the view's columns.

</para>

</note>

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