Re: Need help to make space on my database

On 4/29/24 07:33, Cocam' server wrote:

Please reply to list also
Ccing list

> No, the aim is also to reallocate free space to the system for the other
> tasks it performs.(That's why I said I'd like it returned to the OS)

You led with:

"I need help to make space on my database".

How much current free space do you have available on the disk?

Did you VACUUM FULL a table at a time or all of them at once?

What are the individual tables sizes?

>
> Le lun. 29 avr. 2024 à 16:19, Adrian Klaver <adrian(dot)klaver(at)aklaver(dot)com
> <mailto:adrian(dot)klaver(at)aklaver(dot)com>> a écrit :
>
> On 4/29/24 06:45, Cocam' server wrote:
> > Hello.
> >
> > I need help to make space on my database. I have tables that are
> several
> > GB in size. I used to use the VACUUM FULL VERBOSE command; but
> now, this
> > command is too greedy in free space to be used and I'm looking
> for a way
> > to make free space (given back to the OS)
> >
> > Thanks in advance to everyone who responds
>
> Per
>
> https://www.postgresql.org/docs/current/sql-vacuum.html
> <https://www.postgresql.org/docs/current/sql-vacuum.html>
>
> "VACUUM reclaims storage occupied by dead tuples. In normal PostgreSQL
> operation, tuples that are deleted or obsoleted by an update are not
> physically removed from their table; they remain present until a VACUUM
> is done. Therefore it's necessary to do VACUUM periodically, especially
> on frequently-updated tables.
>
> <...>
>
> Plain VACUUM (without FULL) simply reclaims space and makes it
> available
> for re-use. This form of the command can operate in parallel with
> normal
> reading and writing of the table, as an exclusive lock is not obtained.
> However, extra space is not returned to the operating system (in most
> cases); it's just kept available for re-use within the same table.
> "
>
> So a regular VACUUM should work if all you want to do is give the
> database the ability to recycle the vacuumed tuple space.
>
> --
> Adrian Klaver
> adrian(dot)klaver(at)aklaver(dot)com <mailto:adrian(dot)klaver(at)aklaver(dot)com>
>

--
Adrian Klaver
adrian(dot)klaver(at)aklaver(dot)com