| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | Simon Riggs <simon(at)2ndquadrant(dot)com> |
| Cc: | Peter Geoghegan <pg(at)bowt(dot)ie>, Pavan Deolasee <pavan(dot)deolasee(at)gmail(dot)com>, Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>, Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>, Andrew Dunstan <andrew(dot)dunstan(at)2ndquadrant(dot)com>, Pavan Deolasee <pavan(dot)deolasee(at)2ndquadrant(dot)com>, Stephen Frost <sfrost(at)snowman(dot)net>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: [HACKERS] MERGE SQL Statement for PG11 |
| Date: | 2018-03-26 15:09:42 |
| Message-ID: | CA+Tgmob_onSg+BiVJtwXCSvqZfOj__e6X+3bRAxDhcJNL2_wjA@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Mon, Mar 26, 2018 at 5:53 AM, Simon Riggs <simon(at)2ndquadrant(dot)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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