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Re: Block-level CRC checks

From: Florian Weimer <fweimer(at)bfk(dot)de>
To: Simon Riggs <simon(at)2ndQuadrant(dot)com>
Cc: Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>, Bruce Momjian <bruce(at)momjian(dot)us>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, 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 15:01:19
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
* Simon Riggs:

> * Put all hint bits in the block header to allow them to be excluded
> more easily from CRC checking. If we used 3 more bits from
> ItemIdData.lp_len (limiting tuple length to 4096) then we could store
> some hints in the item pointer. HEAP_XMIN_INVALID can be stored as
> LP_DEAD, since that will happen very quickly anyway. 

What about putting the whole visibility information out-of-line, into
its own B-tree, indexed by page number?

Florian Weimer                <fweimer(at)bfk(dot)de>
BFK edv-consulting GmbH
Kriegsstra├če 100              tel: +49-721-96201-1
D-76133 Karlsruhe             fax: +49-721-96201-99

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