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doubt about datum

From: Luca Ferrari <fluca1978(at)infinito(dot)it>
To: pgsql-novice(at)postgresql(dot)org
Subject: doubt about datum
Date: 2007-07-29 13:25:42
Message-ID: (view raw or whole thread)
Lists: pgsql-novice
Hi all,
I'm new to postgresql programming and I'd like to understand what a datum is 
(what is its purpose); I guess it is a kind of OID for customized data type 
created by users, but I'm not sure. Moreover why it does not need transaction 
visibility as an ordinary tuple (xmin, cmin, cmax, xmax)?



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