Re: BUG #16739: Temporary files not deleting from data folder on disk

Hello Tom,

Thanks for writing back.

I have checked the files, but these files are temporary and vanish once the
Postgres service is restarted.
This has been seen many times.

Adding more data to support my point in form of attachment.

*Thanks and Regards*
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*Manoj Kumar*
Associate Tech Lead | AMEYO
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On Mon, Nov 23, 2020 at 9:03 PM Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:

> PG Bug reporting form <noreply(at)postgresql(dot)org> writes:
> > There is a problem with Postgres that temporary tables being created are
> not
> > cleaning up by Postgres itself.
>
> Can you produce any actual evidence of that, or even better a reproduction
> sequence?
>
> > Count of temporary files-
> > select count(*) from pg_ls_dir ( '/var/lib/pgsql/10/data/base/16384' ) as
> > file where file::text not in (select oid::text from pg_class );
>
> This is not evidence, because the test is completely incorrect.
>
> * OID is not the pg_class field to use. relfilenode is closer,
> although that will still mislead you for certain system catalogs.
> pg_relation_filenode(oid) is really the recommended way to get the
> base file name for a pg_class entry.
>
> * Even once you've got the right filename, it's only the *base* file
> name. There might be additional segments (nnn.1, nnn.2, etc) if any
> table exceeds 1GB. There are likely to also be "nnn_fsm" and
> "nnn_vm" subsidiary files, and maybe "nnn_init" files. All of those
> would have to be excluded before concluding that files are being
> leaked.
>
> See
>
> https://www.postgresql.org/docs/current/storage.html
>
> for more info about what you should expect to see in a database
> directory.
>
> regards, tom lane
>

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