Hi guys,

What is the meaning of following Constraint types which I saw in dba_constraints

C
O
P
R
U
V

I think all know about C, P, R and U but what about O and V?

Secondly, what is the exact use of perfmon utility of NT and how can I use it for performance monitoring of Oracle Database. I have never found it very useful and much enjoying.

Thanks in Adv.