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From: Laurenz Albe <[email protected]>
To: blockdump <[email protected]>
To: [email protected]
Subject: Re: Reset date for Cumulative Statistics System when not in table
Date: Mon, 26 Feb 2024 16:40:53 +0100
Message-ID: <[email protected]> (raw)
In-Reply-To: <CAJzQbyUCuUNxF8Sv4W5ngtMjWBBfK6dipCgLRLNxQoBhDEu1jQ@mail.gmail.com>
References: <CAJzQbyUCuUNxF8Sv4W5ngtMjWBBfK6dipCgLRLNxQoBhDEu1jQ@mail.gmail.com>

On Mon, 2024-02-26 at 14:47 +0100, blockdump wrote:
> I am new to Postgres and started reading about the The Cumulative Statistics System. 
> https://www.postgresql.org/docs/current/monitoring-stats.html#MONITORING-PG-STATIO-ALL-TABLES-VIEW
> 
> When I came across pg_statio_all_tables I was wondering what is the reference date for the
> counters like (heap_blks_read, heap_blks_hit ... ) This table does not have a stats_reset column like others. 
> So are this numbers accumulating from the creation of the table or since the startup of the cluster ?
> 
> Maybe someone can drop me a line.

Statistics survive a restart, but not a crash, so the statistics are
collected since the table was created, the latest crash happened or the
statistics were reset; whatever happened last.

Unfurtunately there is no way to find out the time when that happened.

Yours,
Laurenz Albe

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