SQL> desc dba_waiters
Name Null? Type
----------------------------------------- -------- ----------------------------
WAITING_SESSION NUMBER
HOLDING_SESSION NUMBER
LOCK_TYPE VARCHAR2(26)
MODE_HELD VARCHAR2(40)
MODE_REQUESTED VARCHAR2(40)
LOCK_ID1 NUMBER
LOCK_ID2 NUMBER

SQL> desc dba_blockers
Name Null? Type
----------------------------------------- -------- ----------------------------
HOLDING_SESSION NUMBER

SQL> desc dba_ddl_locks
Name Null? Type
----------------------------------------- -------- ----------------------------
SESSION_ID NUMBER
OWNER VARCHAR2(30)
NAME VARCHAR2(30)
TYPE VARCHAR2(40)
MODE_HELD VARCHAR2(9)
MODE_REQUESTED VARCHAR2(9)

SQL> desc dba_dml_locks
Name Null? Type
----------------------------------------- -------- ----------------------------
SESSION_ID NUMBER
OWNER NOT NULL VARCHAR2(30)
NAME NOT NULL VARCHAR2(30)
MODE_HELD VARCHAR2(13)
MODE_REQUESTED VARCHAR2(13)
LAST_CONVERT NUMBER
BLOCKING_OTHERS VARCHAR2(40)

SQL>

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