Re: pg_dump of database with numerous objects

On 5/31/20 8:05 AM, tony(at)exquisiteimages(dot)com wrote:
> I have always used pg_basebackup to backup my database and I have never
> had any issues.
>
> I am now needing to upgrade to a new version of PostgreSQL and I am
> running into problems when pg_upgrade calls pg_dump. pg_dump stalled at:
> "pg_dump: saving database definition" for 24 hours before I killed the
> process.

Where you using the jobs option?:

https://www.postgresql.org/docs/12/pgupgrade.html

-j njobs
--jobs=njobs

number of simultaneous processes or threads to use

>
> My pg_class table contains 9,000,000 entries and I have 9004 schema.
>
> I was able to get output from pg_dump if I used the -n option to dump
> schema with wildcards. I was able to use -n 'data???x' where x was a
> digit from 0 to 9. This way I was able to execute 10 concurrent pg_dump
> processes and dump the database in 30 minutes. I then dumped the public
> schema and used pg_dumpall to dump the globals.
>
> Can anyone tell me if there is something else I need to do to manually
> dump the database? What I did do seems to have restored correctly on the
> upgraded server, but if I want to make sure that I haven't missed
> anything that will creep up on me.
>
>

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