RE: Primary Keys optional?

Primary keys are becoming more and more important.  There are optimization 
enhancements which will depend on the primary key.  Perhaps some do even now, 
I'm nost sure.

Ian MacGregor 

-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On 
Behalf Of Allen, Brandon
Sent: Thursday, August 17, 2006 3:29 PM
To: andert@xxxxxxxxx; oracle-l@xxxxxxxxxxxxx
Subject: RE: Primary Keys optional?

I'm not trying to promote the creation of tables w/o PKs, but just FYI -
I work with the Baan ERP application (you've probably never heard of it,
but I think they used to be #5 behind SAP, Oracle, etc. - Boeing is
their largest customer) and they do not use PKs or any RI in the
database - they use unique indexes with not null constraints, and they
manage all the RI w/in the application.  Not ideal, but I must admit
they've done a pretty good job of implementing it this way - it's never
caused us any problems in the 8yrs I've been working with it.  I've
heard that some of the other big ERPs (maybe even SAP - anyone know?)
are designed similarly.

Another thing to consider in letting the app manage the RI is that you
can't easily view the relationships for reporting purposes when trying
to use Crystal or some other 3rd party reporting tool.

Regards,
Brandon




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