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Concurrant Read Consistency - why only Oracle?

From: Joachim Pense <joachim.pense_at_t-online.de>
Date: Fri, 22 Dec 2000 21:03:22 +0100
Message-ID: <920c2e$2n5$07$1@news.t-online.com> 






Hi,



All DBMS's I know establish consistency by locking, possibly allowing "you 
asked for it, you got it"-type dirty reads - all except Oracle.



Is there a reason for that?


Is the Oracle read consistency concept that uses the rollback log files 
patented?


Or is there a serious drawback that keeps the other manufacturers from 
using it? 



For me it looks like an obvious advantage, so there must be something that 
I'm missing.



Joachim
Received on Fri Dec 22 2000 - 14:03:22 CST












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