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DBA_WAITERS shows all the sessions that are waiting for a lock, but do not hold locks for which another session is waiting.
DBA_WAITERS
WAITING_SESSION
NUMBER
The waiting session
HOLDING_SESSION
The holding session
LOCK_TYPE
VARCHAR2(26)
The lock type
MODE_HELD
VARCHAR2(40)
The mode held
MODE_REQUESTED
The mode requested
LOCK_ID1
Lock ID 1
LOCK_ID2
Lock ID 2