| From: | Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com> |
|---|---|
| To: | Simon Riggs <simon(at)2ndQuadrant(dot)com> |
| Cc: | Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov>, david(at)fetter(dot)org, andres(at)anarazel(dot)de, aidan(at)highrise(dot)ca, stark(at)mit(dot)edu, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: 16-bit page checksums for 9.2 |
| Date: | 2012-01-06 19:45:45 |
| Message-ID: | 4F074F69.7070701@enterprisedb.com |
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| Lists: | pgsql-hackers |
On 06.01.2012 20:26, Simon Riggs wrote:
> The following patch (v4) introduces a new WAL record type that writes
> backup blocks for the first hint on a block in any checkpoint that has
> not previously been changed. IMHO this fixes the torn page problem
> correctly, though at some additional loss of performance but not the
> total catastrophe some people had imagined. Specifically we don't need
> to log anywhere near 100% of hint bit settings, much more like 20-30%
> (estimated not measured).
How's that going to work during recovery? Like in hot standby.
--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com
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