Re: size of attributes table is too big

st 19. 3. 2025 v 18:14 odesílatel Álvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>
napsal:

> Hello
>
> On 2025-Mar-19, Siraj G wrote:
>
> > I have a PG (v16) instance which is occupying around 1TB of storage. Out
> of
> > this, around 350GB is occupied by the table pg_catalog.pg_attribute.
> > Why is the catalog table's size so big?
>
> Heavy use of temp tables is a known cause of this.
>
> > I think this table must have tons of dead tuples. Please suggest to me if
> > we can purge any data/shrink the size of this table.
>
> Yeah, I'd also bet that there are tons of dead tuples, or just unused
> free space. To purge it you would use VACUUM FULL, though that would
> need to lock all accesses to the table.
>
> Does your instance run with autovacuum disabled perchance?
>

or long unclosed transactions, maybe forgotten replication slots, ...

It is very strange so with this size it is still usable. Today hardware is
unbelievable strong

Regards

Pavel

>
> --
> Álvaro Herrera PostgreSQL Developer —
> https://www.EnterpriseDB.com/
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>
>
>