Re: Vacuum statistics

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.