>>>>> "s" == sinisa <sinisa@stripped> writes:
>> I've seen this echoed on this list many times. Exactly what
>> performance penalty would there be if you did *not* have any FOREIGN
>> KEYS on a given set of tables? Why is there a penalty in this
>> situation? I can't imagine why this would be.
>>
s> Exactly the same thing that would make triggers slow down RDBMS.On any
s> possible update and delete and replace, a code should have to go
s> through, possibly very lengthy linked list of conditions, bans
s> etc. After that code would have to check for a specific datum,
s> whether it is OK or not, etc, etc ..
I still don't see why there is a penalty to have FOREIGN KEYS in the
DBMS when you don't use them. If the tables have no FORIEGN KEYS then
why is there a speed penalty? There are no conditions to check. I
agree that if you use the FOREIGN KEYS there will be a penalty, but
that's ok if I need them.
