Am 2015-05-04 18:19, schrieb Mel Llaguno:
> My understanding of parallel dump performance is that it only makes a
> difference when you have a large number of DBs (thousands if not tens
> of
> thousands). We performed similar testing using 9.3.x and found little
> performance gains using -j (with 100+ tables). See Bruce Momjian’s
> post :
> http://momjian.us/main/blogs/pgblog/2012.html
I don't know about parallel pg_dump as we use -Fc and pg_dump can't do
that in parallel (afaik). For dumping I have wrapped pg_dump in a shell
script to dump several databases in parallel.
But for pg_restore -j option does make a big difference, at least when
you have a lot of larger tables and indexes.
Regards,
Jan