Re: WIP: Avoid creation of the free space map for small tables

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От John Naylor
Тема Re: WIP: Avoid creation of the free space map for small tables
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Msg-id CACPNZCsWa=dd0K+FiODwM=LEsepAHVJCoSx2Avew=xBEX3Ywjw@mail.gmail.com
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Ответ на Re: WIP: Avoid creation of the free space map for small tables  (Alvaro Herrera <alvherre@2ndquadrant.com>)
Ответы Re: WIP: Avoid creation of the free space map for small tables  (Amit Kapila <amit.kapila16@gmail.com>)
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On Thu, Feb 21, 2019 at 9:27 PM Alvaro Herrera <alvherre@2ndquadrant.com> wrote:
>
> I think this test is going to break on nonstandard block sizes.  While
> we don't promise that all tests work on such installs (particularly
> planner ones), it seems fairly easy to cope with this one -- just use a
> record size expressed as a fraction of current_setting('block_size').
> So instead of "1024" you'd write current_setting('block_size') / 8.
> And then display the relation size in terms of pages, not bytes, so
> divide pg_relation_size by block size.

I've done this for v6, tested on 16k block size.

-- 
John Naylor                https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

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