So, piping or redirecting to a file? If so, then that's the problem.
pg_dump directly to a file puts file offsets in the TOC.
This how I do custom dumps:
cd $BackupDir
pg_dump -Fc --compress=zstd:long -v -d${db} -f ${db}.dump 2> ${db}.log
On Tue, Sep 16, 2025 at 8:54 PM R Wahyudi <rwahyudi@xxxxxxxxx> wrote:
pg_dump was done using the following command :
pg_dump -Fc -Z 0 -h <host> -U <user> -w -d <database>On Wed, 17 Sept 2025 at 08:36, Adrian Klaver <adrian.klaver@xxxxxxxxxxx> wrote:On 9/16/25 15:25, R Wahyudi wrote:
>
> I'm trying to troubleshoot the slowness issue with pg_restore and
> stumbled across a recent post about pg_restore scanning the whole file :
>
> > "scanning happens in a very inefficient way, with many seek calls and
> small block reads. Try strace to see them. This initial phase can take
> hours in a huge dump file, before even starting any actual restoration."
> see : https://www.postgresql.org/message-id/E48B611D-7D61-4575-A820-
> B2C3EC2E0551%40gmx.net <https://www.postgresql.org/message-id/
> E48B611D-7D61-4575-A820-B2C3EC2E0551%40gmx.net>
This was for pg_dump output that was streamed to a Borg archive and as
result had no object offsets in the TOC.
How are you doing your pg_dump?
--
Adrian Klaver
adrian.klaver@xxxxxxxxxxx
Death to <Redacted>, and butter sauce.
Don't boil me, I'm still alive.
<Redacted> lobster!
