RE: primary keys and dictionary overhead
- From: "Chitale, Hemant Krishnarao" <Hemant.Chitale@xxxxxx>
- To: <oratune@xxxxxxxxx>
- 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
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On
Behalf Of David Fitzjarrell
Sent: Thursday, October 20, 2011 4:53 AM
To: mark.powell2@xxxxxx; 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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