Re: slow building index and reference after Sybase to Pg

From: Gary Fu <gfu(at)sigmaspace(dot)com>
To: Andres Freund <andres(at)anarazel(dot)de>
Cc: <pgsql-general(at)postgresql(dot)org>
Subject: Re: slow building index and reference after Sybase to Pg
Date: 2011-02-28 23:16:14
Message-ID: 4D6C2CBE.2010503@sigmaspace.com
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On 02/28/11 17:56, Andres Freund wrote:
> Hi,
>
> On Saturday, February 26, 2011 12:11:19 AM Gary Fu wrote:
>> wal_buffers = 16MB
> sensible
>> checkpoint_segments = 256
> A setting that high seems unlikely to be beneficial... I suggest you configure
> log_checkpoints to monitor this.
>
>> effective_cache_size = 30GB
> Not likely to matter in this case.
>
>> maintenance_work_mem = 2GB
> 1GB is the max value taking effect.
>
> I would also suggest setting
> wal_sync_method=fdatasync
Already set this.
> You haven't configured shared_buffers at all? I would suggest setting it to 2GB
> or such.
>
It is set to 12GB.

Do you recommend to set fsync to off ? It needs to restart the server.

Thanks,
Gary

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