Do checkpoints flush all data from shared buffers ?

From: Fabrice Franquenk <Fabrice(dot)Franquenk(at)bull(dot)net>
To: pgsql-general(at)postgresql(dot)org
Subject: Do checkpoints flush all data from shared buffers ?
Date: 2006-07-07 09:50:11
Message-ID: 44AE2E53.2020406@bull.net
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Hello,
I was wondering if each checkpoint would flush all transactions from
the shared buffers or if there could be some left at the end of the
checkpoint ?
Because i was trying to lower I/Os of the disks, i got the checkpoint
timeout lowered to 150 seconds so i get twice the number the checkpoint.
I was hoping it would reduce the number of I/Os on the disks because
there would be less data to write in datafiles...

Thanks in advance for your help

regards,
Fabrice Franquenk

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