On Thu, 2023-10-26 at 15:49 +0700, Andrei Lepikhov wrote:
> It is the gist of my question. If needed, You can remove the record
> by
> (userid, dbOid, queryId). As I understand, this extension is usually
> used by an administrator. Who can reset these parameters except you
> and
> the DBMS?
This extension is used by administrator but indirectly through some
kind of sampling solution providing information about statistics change
over time. The only kind of statistics unavailable to sampling
solutions without a periodic reset is a min/max statistics. This patch
provides a way for resetting those statistics without entry eviction.
Suppose the DBA will use several sampling solutions. Every such
solution can perform its own resets of min/max statistics. Other
sampling solutions need a way to detect such resets to avoid undetected
interference. Timestamping of min/max reset can be used for that
purpose.
--
regards, Andrei Zubkov
Postgres Professional