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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Ian Westmacott <ianw@intellivid.com>
Cc: Jim C. Nasby <jnasby@pervasive.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: improving write performance for logging
Date: Fri, 06 Jan 2006 15:27:46 -0500
Message-ID: <22489.1136579266@sss.pgh.pa.us> (raw)
In-Reply-To: <1136574178.31602.13.camel@spectre.intellivid.com>
References: <43BB0C5C.8020207@computer.org>
	<1136382865.24450.7.camel@spectre.intellivid.com>
	<7.0.1.0.2.20060104092139.01c37da0@earthlink.net>
	<1136390438.24450.49.camel@spectre.intellivid.com>
	<20060106010822.GK43311@pervasive.com>
	<1136556006.31602.5.camel@spectre.intellivid.com>
	<20060106163732.GL3902@pervasive.com>
	<1136574178.31602.13.camel@spectre.intellivid.com>

Ian Westmacott <ianw@intellivid.com> writes:
> If the WAL is lost, can you lose more than the data since the last
> checkpoint?

The problem is that you might have partially-applied actions since the
last checkpoint, rendering your database inconsistent; then *all* the
data is suspect if not actually corrupt.

			regards, tom lane



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