Re: [HACKERS] MERGE SQL Statement for PG11

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От Robert Haas
Тема Re: [HACKERS] MERGE SQL Statement for PG11
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Msg-id CA+Tgmob_onSg+BiVJtwXCSvqZfOj__e6X+3bRAxDhcJNL2_wjA@mail.gmail.com
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Ответ на Re: [HACKERS] MERGE SQL Statement for PG11  (Simon Riggs <simon@2ndquadrant.com>)
Ответы Re: [HACKERS] MERGE SQL Statement for PG11  (Simon Riggs <simon@2ndquadrant.com>)
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On Mon, Mar 26, 2018 at 5:53 AM, Simon Riggs <simon@2ndquadrant.com> wrote:
> Since we now have MVCC catalog scans, all the name lookups are
> performed using the same snapshot so in the above scenario the newly
> created object would be invisible to the second name lookup.

That's not true, because each lookup would be performed using a new
snapshot -- not all under one snapshot.

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


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