| From: | Andres Freund <andres(at)2ndquadrant(dot)com> |
|---|---|
| To: | Bruce Momjian <bruce(at)momjian(dot)us> |
| Cc: | PostgreSQL Bugs <pgsql-bugs(at)postgresql(dot)org>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
| Subject: | Re: pg_upgrade < 9.3 -> >=9.3 misses a step around multixacts |
| Date: | 2014-05-30 21:03:53 |
| Message-ID: | 20140530210353.GI30516@awork2.anarazel.de |
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| Lists: | pgsql-bugs |
On 2014-05-30 16:35:15 -0400, Bruce Momjian wrote:
> On Fri, May 30, 2014 at 05:13:17PM +0200, Andres Freund wrote:
> > It'd need to be clusters that used more multixacts than fit onto two
> > slru offsets/ segments in < 9.2. Otherwise things will probably just
> > continue to work because there's no hole.
>
> Do you mean <= 9.2 here for the old cluster?
yes.
> Multi-xacts were added in 9.3:
That's not really correct. They were added in 8.2 or something...
> commit 0ac5ad5134f2769ccbaefec73844f8504c4d6182
> Author: Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>
> Date: Wed Jan 23 12:04:59 2013 -0300
>
> Improve concurrency of foreign key locking
That just expanded the usage to also be able to track updated rows.
Greetings,
Andres Freund
--
Andres Freund http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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