Re: [HACKERS] Metadata about relation creation & full scans.

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От Tom Lane
Тема Re: [HACKERS] Metadata about relation creation & full scans.
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Msg-id 25097.1490192054@sss.pgh.pa.us
обсуждение исходный текст
Ответ на [HACKERS] Metadata about relation creation & full scans.  (Andres Freund <andres@anarazel.de>)
Ответы Re: [HACKERS] Metadata about relation creation & full scans.
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Andres Freund <andres@anarazel.de> writes:
> I propose that for each pg_class entry we start to keep the following
> additional metadata:
> - CATALOG_VERSION_NO at relation creation
> - PG_VERSION_NUM at relation creation
> - CATALOG_VERSION_NO at last full scan by vacuum
> - PG_VERSION_NUM at last full scan by vacuum

(1) It's very very hard for me to believe that we need *two* versions of
the version number.  Pick one.

(2) How you gonna update this in vacuum?  It cannot do a transactional
update.
        regards, tom lane

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