Does anybody knows about the "defunct process" ?

In our production sevrer , we are running Oracle 10g in IBM AIX 5.1 unix platform . Our application software is based on the .net .

Now from last 7 days , our production server creates a lot of "defunct process" which consumes a lot or resource (i think) and r production server's PAGING space goes to 76% above .

In this moment , anybody plz tell me ,

why defunct process is created and how can I get rid of this problem ?
Is the problem is related with the application ?

Plz reply me ASAP .. ...

they are "Zombie" processes. They are created by a parent process, but then not used or closed correctly, which keeps the resources unavailable. They get created for all sorts of reasons, and it can be hard working out why they are there. Best to look at what the processes are, and also what created them. It's often a bug in the parent process, but plenty of other reasons too. Note that as they are Zombies, they can't be killed. It's only when the parent process goes, from a service restart, kill, etc... that they will go with it.