oradebug suspend

oradebug suspend stops the execution of a session until it resumed again with oradebug resume.

This method is an (unsupported) way to not kill a session that uses lots of resources so that other users can work faster.

oradebug setorapid …
oradebug suspend

Of course, if the session/process holds a latch and is then supsended, the latch will not be given up until the suspension which could lead to quite serious problems.