RE: WAL & SHM principles - Mailing list pgsql-hackers

From Mikheev, Vadim
Subject RE: WAL & SHM principles
Date
Msg-id 8F4C99C66D04D4118F580090272A7A234D32FA@sectorbase1.sectorbase.com
Whole thread Raw
In response to WAL & SHM principles  (Martin Devera <devik@cdi.cz>)
Responses Re: WAL & SHM principles  (ncm@zembu.com (Nathan Myers))
List pgsql-hackers
> 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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