Re: [WIP] Double-write with Fast Checksums

From: Simon Riggs <simon(at)2ndQuadrant(dot)com>
To: Josh Berkus <josh(at)agliodbs(dot)com>
Cc: pgsql-hackers(at)postgresql(dot)org
Subject: Re: [WIP] Double-write with Fast Checksums
Date: 2012-01-11 23:13:20
Message-ID: CA+U5nMJv8aWffQbxDXx4vT+m4U0stViTJJ4OXM3rULQknpGSSg@mail.gmail.com
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On Wed, Jan 11, 2012 at 11:07 PM, Josh Berkus <josh(at)agliodbs(dot)com> wrote:
> On 1/11/12 1:25 PM, Dan Scales wrote:
>> And just wanted to reiterate one other benefit of double writes -- it greatly reduces the size of the WAL logs.
>
> Even if you're replicating?

Yes, but it will increase random I/O on the standby when we replay if
we don't have FPWs.

--
 Simon Riggs                   http://www.2ndQuadrant.com/
 PostgreSQL Development, 24x7 Support, Training & Services

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