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Re: Block-level CRC checks

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Greg Stark <gsstark(at)mit(dot)edu>
Cc: Bruce Momjian <bruce(at)momjian(dot)us>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>, Aidan Van Dyk <aidan(at)highrise(dot)ca>, Alvaro Herrera <alvherre(at)commandprompt(dot)com>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Block-level CRC checks
Date: 2009-12-01 19:17:52
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
Greg Stark <gsstark(at)mit(dot)edu> writes:
> Another thought is that would could use the MSSQL-style torn page
> detection of including a counter (or even a bit?) in every 512-byte
> chunk which gets incremented every time the page is written.

I think we can dismiss that idea, or any idea involving a per-page
status value, out of hand.  The implications for tuple layout are
just too messy.  I'm not especially thrilled with making assumptions
about the underlying device block size anyway.

			regards, tom lane

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