V$LOCK

Columns
   ___________________________
 
   ADDR
   KADDR
   SID
   TYPE
   ID1
   ID2
   LMODE
   REQUEST
   CTIME
   BLOCK

Related:

V$ENQUEUE_LOCK
V$EVENT_NAME
V$LATCH
V$LIBRARYCACHE
V$_LOCK
V$LOCKED_OBJECT
V$LOCKS_WITH_COLLISIONS
V$LOCK_ACTIVITY 
V$LOCK_ELEMENT
V$RESOURCE
V$RESOURCE_LIMIT
V$TRANSACTION_ENQUEUE