On Friday, January 06, 2012 08:45:45 PM Heikki Linnakangas wrote: > 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. How's recovery a problem? Unless I miss something that doesn't actually introduce a new possibility to transport hint bits to the standby (think fpw's). A new transport will obviously increase traffic but ...
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