Re: docs update for count(*) and index-only scans

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От Robert Haas
Тема Re: docs update for count(*) and index-only scans
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Msg-id CA+TgmoZtsfwOdUcW4v1o7S8ERW3YiNqx39eqHSwP+rKk2DSDMw@mail.gmail.com
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Ответ на Re: docs update for count(*) and index-only scans  (Marti Raudsepp <marti@juffo.org>)
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On Tue, Dec 6, 2011 at 11:27 AM, Marti Raudsepp <marti@juffo.org> wrote:
> On Tue, Dec 6, 2011 at 05:14, Josh Kupershmidt <schmiddy@gmail.com> wrote:
>> Maybe just tweak
>> "will be executed" to "will often be executed", or change "using a
>> sequential scan of the entire table." to "using a sequential scan of
>> the table, or an index-only scan of one of its indexes".
>
> I don't think we need to specify what the planner does at all. How
> about simply "will need to access all rows [in the table]"
>
> Also +1 for removing references to "other SQL databases".

I just modified this so that it's not outright wrong any more.  I
think it's still more pessimistic than is warranted, but I wasn't sure
exactly how to rephrase it.

--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

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