Re: ANALYZE sampling is too good

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От Simon Riggs
Тема Re: ANALYZE sampling is too good
Дата
Msg-id CA+U5nMJ+kp_xhV8LSSOG_ekTBRvD5YMYntSLGANDK9pUerYWyw@mail.gmail.com
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Ответ на Re: ANALYZE sampling is too good  (Greg Stark <stark@mit.edu>)
Ответы Re: ANALYZE sampling is too good
Re: ANALYZE sampling is too good
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On 11 December 2013 00:28, Greg Stark <stark@mit.edu> wrote:
>    On Wed, Dec 11, 2013 at 12:14 AM, Simon Riggs <simon@2ndquadrant.com> wrote:
>> Block sampling, with parameter to specify sample size. +1
>
> Simon this is very frustrating. Can you define "block sampling"?

Blocks selected using Vitter's algorithm, using a parameterised
fraction of the total.

When we select a block we should read all rows on that block, to help
identify the extent of clustering within the data.

-- Simon Riggs                   http://www.2ndQuadrant.com/PostgreSQL Development, 24x7 Support, Training & Services



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