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Re: 7 hrs for a pg_restore?

From: Richard Huxton <dev(at)archonet(dot)com>
To: Douglas J Hunley <doug(at)hunley(dot)homeip(dot)net>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: 7 hrs for a pg_restore?
Date: 2008-02-19 18:13:37
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-performance
Douglas J Hunley wrote:
> I spent a whopping seven hours restoring a database late Fri nite for a 
> client. We stopped the application, ran pg_dump -v -Ft -b -o $db > 
> ~/pre_8.3.tar on the 8.2.x db, and then upgrading the software to 8.3. I then 
> did a pg_restore -v -d $db ./pre_8.3.tar and watched it positively crawl.
> I'll grant you that it's a 5.1G tar file, but 7 hours seems excessive. 

Depends, both on the machine and the database.

What sort of disk i/o are you seeing, what's the cpu(s) doing, and 
what's the restore taking so long over (since you have -v)?

Oh, and have you tweaked the configuration settings for the restore? 
Lots of work_mem, turn fsync off, that sort of thing.

   Richard Huxton
   Archonet Ltd

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