Re: Confusing comment in pg_upgrade in regards to VACUUM FREEZE

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От Craig Ringer
Тема Re: Confusing comment in pg_upgrade in regards to VACUUM FREEZE
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Msg-id CAMsr+YHLaWRc6R5j5Kb2+bXJp+Ftje3QGNs7nKxzUYAvfE61hA@mail.gmail.com
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Ответ на Confusing comment in pg_upgrade in regards to VACUUM FREEZE  (David Rowley <david.rowley@2ndquadrant.com>)
Ответы Re: Confusing comment in pg_upgrade in regards to VACUUM FREEZE  (Alvaro Herrera <alvherre@2ndquadrant.com>)
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On 18 April 2016 at 12:11, David Rowley <david.rowley@2ndquadrant.com> wrote:
 
this is not helping me much as I don't really understand why
pg_statistic need to be frozen?

Yeah, in particular it's not clear to me why pg_upgrade goes to such efforts to freeze everything when it copies pg_clog over in copy_clog_xlog_xid() .

Is it mainly a defense against the multixact format change?

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

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