PG 17 has integrated zstd compression, while --format=directory lets you do multi-threaded dumps. That's much faster than a single-threaded pg_dump into a multi-threaded compression program.
(If for _Reasons_ you require a single-file backup, then tar the directory of compressed files using the --remove-files option.) On Tue, Sep 16, 2025 at 10:50 PM R Wahyudi <[email protected]> wrote: > Sorry for not including the full command - yes , its piping to a > compression command : > | lbzip2 -n <threadsforbzipgoeshere>--best > <filenamegoeshere> > > > I think we found the issue! I'll do further testing and see how it goes ! > > > > > > On Wed, 17 Sept 2025 at 11:02, Ron Johnson <[email protected]> > wrote: > >> 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 <[email protected]> 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 <[email protected]> >>> 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 >>>> [email protected] >>>> >>> >> >> -- >> Death to <Redacted>, and butter sauce. >> Don't boil me, I'm still alive. >> <Redacted> lobster! >> > -- Death to <Redacted>, and butter sauce. Don't boil me, I'm still alive. <Redacted> lobster!
