Re: db constraints evaluation question
From: martin pein <martin_at_pein-city.de>
Date: 2000/03/19
Message-ID: <B4FA6130.49DD%martin_at_pein-city.de>#1/1
Date: 2000/03/19
Message-ID: <B4FA6130.49DD%martin_at_pein-city.de>#1/1
>> how do I determine which deferred constraint checks are needed
I was more thinking in terms of an implementors point I view.
When I do an update on x in a table y and if is there is a constraint x<10 on the table, the transaction manager has to check that for updated row(s). If there is another constraint z>10, then checking that, would be a waste of time - given that the value of z doesn't depend on the one of x.
A beter to ask my question would probably be: Is there any work on how to implement such a transaction manager with more complex modelling languges?
Thanks,
Martin
Received on Sun Mar 19 2000 - 00:00:00 CET