Re: [WIP] Double-write with Fast Checksums - Mailing list pgsql-hackers

From Simon Riggs
Subject Re: [WIP] Double-write with Fast Checksums
Date
Msg-id CA+U5nMJv8aWffQbxDXx4vT+m4U0stViTJJ4OXM3rULQknpGSSg@mail.gmail.com
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In response to Re: [WIP] Double-write with Fast Checksums  (Josh Berkus <josh@agliodbs.com>)
Responses Re: [WIP] Double-write with Fast Checksums  (Tom Lane <tgl@sss.pgh.pa.us>)
List pgsql-hackers
On Wed, Jan 11, 2012 at 11:07 PM, Josh Berkus <josh@agliodbs.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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