Message-ID: <4D82B075.7070202@squeakycode.net>
Date: Thu, 17 Mar 2011 20:08:05 -0500
From: Andy Colson <andy@squeakycode.net>
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To: Michael Andreasen <michael@dunlops.com>
CC: pgsql-performance@postgresql.org
Subject: Re: Fastest pq_restore?
References: <AANLkTi=x88_1hTotWNkw8XAGxt2iXs1JmW0WZ4sCtWXm@mail.gmail.com>
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On 03/17/2011 09:25 AM, Michael Andreasen wrote:
> Hi,
>
> I've been looking around for information on doing a pg_restore as fast as possible. It is for a backup machine so I am not interested in anything like crash recovery or anything else that would impact speed of load. I just want to go from no database to database there as fast as possible. The server is for postgresql only and this is the only database, sp both system at postgres can be set however is required for the fast load.
>
> Currently I am using a twin processor box with 2GB of memory and raid 5 disk.
>
> I start postgres before my load with these settings, which have been suggested.
>
>
> shared_buffers = 496MB
> maintenance_work_mem = 160MB
> checkpoint_segments = 30
> autovacuum = false
> full_page_writes=false
>
> maintenance_work_mem and checkpoint_segments were advised to be increased, which I have done, but these are just guess values as I couldn't see any advise for values, other than "bigger".
>
>
> I restore like this;
>
> pg_restore -Fc -j 4 -i -O -d my_db my_db_dump.tbz
>
>
> Even as this, it is still slower than I would like.
>
> Can someone suggest some optimal settings (for postgresql 9) that will get this as quick as it can be?
>
> Thanks.
>
>
>
>
>

autovacuum = off
fsync = off
synchronous_commit = off
full_page_writes = off
bgwriter_lru_maxpages = 0


-Andy