No, you don't. Perhaps you have a requirement to combine DB2 and Oracle data in a job, but you're not going to be connecting to DB2 from the Oracle Enterprise stage.
-craig
"You can never have too many knives" -- Logan Nine Fingers
vinodn - that requirement is like your company buying DataStage but demanding you use Informatica to load your data. The Oracle stage is used to connect to Oracle, the DB2 Stage is used to connect to DB2 and neither database is accessible from a Teredata stage.