| From: | Josh Berkus <josh(at)agliodbs(dot)com> |
|---|---|
| To: | Andres Freund <andres(at)2ndquadrant(dot)com>, Simon Riggs <simon(at)2ndQuadrant(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Stephen Frost <sfrost(at)snowman(dot)net>, Atri Sharma <atri(dot)jiit(at)gmail(dot)com>, Noah Misch <noah(at)leadboat(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Peter Geoghegan <pg(at)heroku(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: ALTER TABLE lock strength reduction patch is unsafe |
| Date: | 2014-03-04 22:29:31 |
| Message-ID: | 531653CB.7050406@agliodbs.com |
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| Thread: | |
| Lists: | pgsql-hackers |
On 03/04/2014 11:43 AM, Andres Freund wrote:
> On March 4, 2014 8:39:55 PM CET, Simon Riggs <simon(at)2ndQuadrant(dot)com> wrote:
>> I was going to add an option to increase lock level, but I can't see
>> why you'd want it even. The dumps are consistent...
>
> Mvcc scans only guarantee that individual scans are consistent, not that separate scans are. Each individual scan takes a new snapshot if there's been ddl.
>
> Andres
>
I thought that we were sharing the same snapshot, for parallel dump?
--
Josh Berkus
PostgreSQL Experts Inc.
http://pgexperts.com
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