RE: WAL & SHM principles

From: "Mikheev, Vadim" <vmikheev(at)SECTORBASE(dot)COM>
To: "'pgsql-hackers(at)postgresql(dot)org'" <pgsql-hackers(at)postgresql(dot)org>
Subject: RE: WAL & SHM principles
Date: 2001-03-07 21:27:34
Message-ID: 8F4C99C66D04D4118F580090272A7A234D32FA@sectorbase1.sectorbase.com
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> It is possible to build a logging system so that you mostly don't care
> when the data blocks get written; a particular data block on disk is
> considered garbage until the next checkpoint, so that you

How to know if a particular data page was modified if there is no
log record for that modification?
(Ie how to know where is garbage? -:))

> might as well allow the blocks to be written any time,
> even before the log entry.

And what to do with index tuples pointing to unupdated heap pages
after that?

Vadim

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