From: Jan Lentfer <Jan.Lentfer@web.de>
To: Mel Llaguno <mllaguno@coverity.com>
Cc: pgsql-admin@postgresql.org
Subject: Re: pg_dump and pg_restore with multiple streams does Not seem to improve overall times
Date: Mon, 04 May 2015 18:42:26 +0200
Message-ID: <7dc008d2afe5d9b9dcfd90a3bb540f98@imap.lan.net> (raw)
In-Reply-To: <D16CF6D3.369FE%mllaguno@coverity.com>
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<D16CF6D3.369FE%mllaguno@coverity.com>
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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
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To: pgsql-admin@postgresql.org
Cc: Jan.Lentfer@web.de, mllaguno@coverity.com
Subject: Re: pg_dump and pg_restore with multiple streams does Not seem to improve overall times
In-Reply-To: <7dc008d2afe5d9b9dcfd90a3bb540f98@imap.lan.net>
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