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Re: Async Commit, v21 (now: v22)

From: Gregory Stark <stark(at)enterprisedb(dot)com>
To: "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: "Jim C(dot) Nasby" <decibel(at)decibel(dot)org>, "Florian Weimer" <fweimer(at)bfk(dot)de>, "Simon Riggs" <simon(at)2ndquadrant(dot)com>, "Peter Eisentraut" <peter_e(at)gmx(dot)net>, "Heikki Linnakangas" <heikki(at)enterprisedb(dot)com>, "Bruce Momjian" <bruce(at)momjian(dot)us>, <pgsql-patches(at)postgresql(dot)org>
Subject: Re: Async Commit, v21 (now: v22)
Date: 2007-07-24 21:37:43
Message-ID: 873azd7aag.fsf@oxford.xeocode.com (view raw or flat)
Thread:
Lists: pgsql-patches
"Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us> writes:

>> If we don't do that then regular users have the ability to put the
>> catalog (and by extension everything else) at risk...
>
> How do you arrive at that conclusion?  The point of the async commit
> patch is that transactions might be lost, as in not really committed,
> but there can be no database corruption.  Otherwise we'd never consider
> making it a userset config setting.

I think the danger that arises is not related to catalogs so much as it is
related to end-of-transaction filesystem operations such as dropping heap
files. If those operations are done but the related transaction commit is lost
then you have a problem.

-- 
  Gregory Stark
  EnterpriseDB          http://www.enterprisedb.com


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