| Oracle® Database Reference 11g Release 2 (11.2) Part Number E10820-03 | 
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DBA_LOCK lists all locks or latches held in the database, and all outstanding requests for a lock or latch.
| Column | Datatype | NULL | Description | 
|---|---|---|---|
| SESSION_ID | NUMBER | Session holding or acquiring the lock | |
| LOCK_TYPE | VARCHAR2(26) | Lock type See Also: For a listing of lock types, see Appendix D, "Oracle Enqueue Names" | |
| MODE HELD | VARCHAR2(40) | Lock mode | |
| MODE REQUESTED | VARCHAR2(40) | Lock mode requested | |
| LOCK_ID1 | VARCHAR2(40) | Type-specific lock identifier, part 1 | |
| LOCK_ID2 | VARCHAR2(40) | Type-specific lock identifier, part 2 | |
| LAST_CONVERT | NUMBER | The last convert | |
| BLOCKING_OTHERS | VARCHAR2(40) | Whether the lock is currently blocking others |