Re: [HACKERS] VACUUM and ANALYZE disagreeing on what reltuples means

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От Tom Lane
Тема Re: [HACKERS] VACUUM and ANALYZE disagreeing on what reltuples means
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Msg-id 19990.1500936945@sss.pgh.pa.us
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Ответ на [HACKERS] VACUUM and ANALYZE disagreeing on what reltuples means  (Tomas Vondra <tomas.vondra@2ndquadrant.com>)
Ответы Re: [HACKERS] VACUUM and ANALYZE disagreeing on what reltuples means  (Tomas Vondra <tomas.vondra@2ndquadrant.com>)
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Tomas Vondra <tomas.vondra@2ndquadrant.com> writes:
> It seems to me that VACUUM and ANALYZE somewhat disagree on what exactly 
> reltuples means. VACUUM seems to be thinking that
>      reltuples = live + dead
> while ANALYZE apparently believes that
>      reltuples = live

> The question is - which of the reltuples definitions is the right one? 
> I've always assumed that "reltuples = live + dead" but perhaps not?

I think the planner basically assumes that reltuples is the live tuple
count, so maybe we'd better change VACUUM to get in step.
        regards, tom lane

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