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Re: pg_upgrade < 9.3 -> >=9.3 misses a step around multixacts - Mailing list pgsql-bugs

From Andres Freund
Subject Re: pg_upgrade < 9.3 -> >=9.3 misses a step around multixacts
Date
Msg-id 20140530210353.GI30516@awork2.anarazel.de
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In response to Re: pg_upgrade < 9.3 -> >=9.3 misses a step around multixacts  (Bruce Momjian <bruce@momjian.us>)
Responses Re: pg_upgrade < 9.3 -> >=9.3 misses a step around multixacts  (Bruce Momjian <bruce@momjian.us>)
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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@alvh.no-ip.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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