Re: pg_dump of database with numerous objects

On 2020-05-31 11:24, Adrian Klaver wrote:
> 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

Yes, I did try with this option. It did dump the postgres database at
the same time as my main database, but my database hung in the same
place.

>
>>
>> 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.
>>
>>