In Oracle, a locked object is a database object that is currently being used by another session and cannot be modified or accessed by other sessions until it is unlocked. Locked objects can cause performance problems and can prevent other users from accessing the data they need.
There are a few different ways to check for locked objects in Oracle. One way is to use the `V$LOCKED_OBJECTS` view. This view contains information about all of the currently locked objects in the database, including the object name, the session that has locked the object, and the type of lock that has been applied.