Re: Heavy write activity on first vacuum of fresh TOAST data

From: "Kevin Grittner" <Kevin(dot)Grittner(at)wicourts(dot)gov>
To: "Simon Riggs" <simon(at)2ndquadrant(dot)com>
Cc: <pgsql-performance(at)postgresql(dot)org>
Subject: Re: Heavy write activity on first vacuum of fresh TOAST data
Date: 2007-12-13 21:19:34
Message-ID: 47614D86.EE98.0025.0@wicourts.gov
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>>> On Thu, Dec 13, 2007 at 12:12 PM, in message
<1197569564(dot)4255(dot)1855(dot)camel(at)ebony(dot)site>, Simon Riggs <simon(at)2ndquadrant(dot)com>
wrote:
> On Thu, 2007-12-13 at 11:46 -0600, Kevin Grittner wrote:
>> If the hint bit changes are written to the WAL ...
>
> They're not.

So one would expect a write-intensive initial vacuum after a
PITR-style recovery?

What impact would lack of the hint bits have until a vacuum?

-Kevin

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