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Re: testing HS/SR - 1 vs 2 performance

Tom Lane <tgl@sss.pgh.pa.us>

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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Simon Riggs <simon@2ndQuadrant.com>
Cc: Heikki Linnakangas <heikki.linnakangas@enterprisedb.com>, Erik Rijkers <er@xs4all.nl>, pgsql-hackers@postgresql.org
Date: 2010-04-25T16:43:57Z
Lists: pgsql-hackers 
Simon Riggs <simon@2ndQuadrant.com> writes:
> [ v2 patch ]

BTW, while I'm looking at this, why bother with the separate
KnownAssignedXidsValid[] array?  Wouldn't it be cheaper
(certainly so in storage, probably so in access/update times)
to have just the KnownAssignedXids[] array and store
InvalidTransactionId in unused entries?

			regards, tom lane