RE: primary keys and dictionary overhead
Date: Thu, 20 Oct 2011 09:59:13 +0800
> Apparently a few vendors did that 20+ years ago and claimed it was for performance reasons. Never mind that their code was suspiciously absent of bind variables forcing a hard parse for every run of a query where only the string literal value was changed.
Oracle V7 was released around 1991 or so. That was the first time a "Shared Pool" was introduced. Awareness of Binds was still sometime in the future.
Hemant K Chitale
From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of David Fitzjarrell Sent: Thursday, October 20, 2011 4:53 AM To: mark.powell2_at_hp.com; ORACLE-L
Subject: Re: primary keys and dictionary overhead
Apparently a few vendors did that 20+ years ago and claimed it was for performance reasons. Never mind that their code was suspiciously absent of bind variables forcing a hard parse for every run of a query where only the string literal value was changed. Never mind that their idea of referential integrity was 'enforced' in the application code and not the database. Never mind that they also enforced uniqueness in the same way. Which explains why migrating from one of these types of applications to one which uses database constraints requires far more data cleanup than should be necessary.
It's funny sometimes what vendors do in the name of 'performance'. David Fitzjarrell
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