Heikki Linnakangas <hlinnaka@iki.fi> writes:
> On Mon, 6 Jun 2005, Tom Lane wrote:
>> Heikki Linnakangas <hlinnaka@iki.fi> writes:
>>> Vacuum doesn't zero out the free space between lower and upper,
>>
>> It does now ;-)
> Oh :). Does it affect vacuum performance?
I haven't tried to measure it ... but certainly it's not totally free.
I'd be happy to rip that change out again.
>> Would this be institutionalizing a particular approach to data
>> compression in the XLogInsert API, though?
> The "skip the free space" optimization is still useful and worthwhile
> even if we have a more sophisticated compression method for the
> rest of the page.
Good point. OK, I'm hacking XLOG stuff now anyway so I'll see about
making that happen.
regards, tom lane