Re: New 8.4 hot standby feature

From: Jason Long <mailing(dot)list(at)supernovasoftware(dot)com>
To: Fujii Masao <masao(dot)fujii(at)gmail(dot)com>
Cc: Gabi Julien <gabi(dot)julien(at)broadsign(dot)com>, pgsql-general(at)postgresql(dot)org
Subject: Re: New 8.4 hot standby feature
Date: 2009-01-28 15:23:07
Message-ID: 4980785B.8040202@supernovasoftware.com
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Fujii Masao wrote:
> Hi,
>
> On Wed, Jan 28, 2009 at 4:28 AM, Gabi Julien <gabi(dot)julien(at)broadsign(dot)com> wrote:
>
>> Yes, the logs are shipped every minute but the recevory is 3 or 4 times
>> longer.
>>
>
> Are you disabling full_page_writes? It may slow down recovery several times.
>
>
>> Thanks I will take a look at it. Also, I came across the record log shipping
>> feature too in my research:
>>
>> http://www.postgresql.org/docs/current/static/warm-standby.html#WARM-STANDBY-RECORD
>>
>> Could this help? If the logs are smaller then I could potentially afford
>> shipping then at a higher frequency.
>>
>
> No. Even if the logs are shipped frequently, they cannot be applied until
> the log file fills.
>
> Regards,
>
>
Is pg_clearxlogtail <http://www.2ndquadrant.com/code/pg_clearxlogtail.c>
going to be in contrib or integrated in some other way?

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