Re: BUG #12990: Missing pg_multixact/members files (appears to have wrapped, then truncated)

From: Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>
To: Thomas Munro <thomas(dot)munro(at)enterprisedb(dot)com>
Cc: Robert Haas <robertmhaas(at)gmail(dot)com>, Kevin Grittner <kgrittn(at)ymail(dot)com>, "tgarnett(at)panjiva(dot)com" <tgarnett(at)panjiva(dot)com>, "pgsql-bugs(at)postgresql(dot)org" <pgsql-bugs(at)postgresql(dot)org>
Subject: Re: BUG #12990: Missing pg_multixact/members files (appears to have wrapped, then truncated)
Date: 2015-04-24 01:59:05
Message-ID: 20150424015905.GO4369@alvh.no-ip.org
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Thomas Munro wrote:

> That's why I proposed not using xid-like logic, and instead using a
> type of three-way comparison that allows you to see when nextOffset
> would 'cross' oldestOffsetStopLimit, instead of the two-way comparison
> that considers half the number-space to be in the past and half in the
> future, in my earlier message.

Yeah, that bit made sense to me.

--
Álvaro Herrera http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

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