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From: Ilia Evdokimov <[email protected]>
To: Alena Rybakina <[email protected]>
To: pgsql-hackers <[email protected]>
Cc: jian he <[email protected]>
Cc: Alexander Korotkov <[email protected]>
Cc: Andrei Zubkov <[email protected]>
Cc: Alena Rybakina <[email protected]>
Cc: [email protected]
Subject: Re: Vacuum statistics
Date: Wed, 16 Oct 2024 13:31:43 +0300
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
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On 08.10.2024 19:18, Alena Rybakina wrote:
> Made a rebase on a fresh master branch.
> -- 
> Regards,
> Alena Rybakina
> Postgres Professional

Thank you for rebasing.

I have noticed that when I create a table or an index on this table, 
there is no information about the table or index in 
pg_stat_vacuum_tables and pg_stat_vacuum_indexes until we perform a VACUUM.

Example:

CREATE TABLE t (i INT, j INT);
INSERT INTO t SELECT i/10, i/100 FROM  GENERATE_SERIES(1,1000000) i;
SELECT * FROM pg_stat_vacuum_tables WHERE relname = 't';
....
(0 rows)
CREATE INDEX ON t (i);
SELECT * FROM pg_stat_vacuum_indexes WHERE relname = 't_i_idx';
...
(0 rows)

I can see the entries after running VACUUM or executing autovacuum. or 
when autovacuum is executed. I would suggest adding a line about the 
relation even if it has not yet been processed by vacuum. Interestingly, 
this issue does not occur with pg_stat_vacuum_database:

CREATE DATABASE example_db;
SELECT * FROM pg_stat_vacuum_database WHERE dbname = 'example_db';
dboid |       dbname | ...
  ...      | example_db | ...
(1 row)

BTW, I recommend renaming the view pg_stat_vacuum_database to 
pg_stat_vacuum_database_S_  for consistency with pg_stat_vacuum_tables 
and pg_stat_vacuum_indexes

--
Regards,
Ilia Evdokimov,
Tantor Labs LLC.

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