Betr: Re: Reclaiming space for dropped database

"Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote on 2019-01-23 16:02:01:

> Alban Hertroys <alban(dot)hertroys(at)apollovredestein(dot)com> writes:
> > Our current development database server is running a bit low on
diskspace,
> > so I dropped an old but rather large database with the intention of
> > claiming back some space. However, the space remains claimed.
> > This server was upgraded from PG10 to PG11 using pg_upgrade's --link
> > option.
>
> If you used --link, then all the files would remain hard-linked from
both
> the old and new database directories. You've got to remove them from
the
> old DB directory as well.
>
> There's not really any point in keeping around the source DB directory
> once you've completed a --link migration. Starting the postmaster in
> the old DB directory would be disastrous because the files are
> inconsistent from its standpoint once the new postmaster has modified
> them at all. (In fact, I think pg_upgrade intentionally makes the old
> directory non-runnable to prevent that error.) So you might as well
> just "rm -rf ./10", not only its biggest subdirectory.

That explains what I'm seeing. After creating a dump (better safe than
sorry), I'll remove that directory.

Thanks!

Regards,
Alban.

Alban Hertroys
D: +31 (0)53 4 888 888 | T: +31 (0)53 4888 888 | E: alban(dot)hertroys(at)apollovredestein(dot)com
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