Greg Stark <st...@mit.edu> writes:
> On Wed, Oct 12, 2011 at 3:29 PM, Tom Lane <t...@sss.pgh.pa.us> wrote:
>> The problem is precisely that the pages a query is going to read are
>> likely to *not* be a random sample, but to be correlated with
>> recently-dirtied pages.
> Sure, but I was suggesting aiming for the nth percentile rather than a
> linear factor which I don't know has any concrete meaning.
Well, I have no problem with using a more complicated estimation
equation, but it might be nice to get some field experience with the
thing before we start complicating matters.
regards, tom lane
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