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Oracle® Database Reference
12c Release 1 (12.1)

E17615-23
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V$LOCKED_OBJECT

V$LOCKED_OBJECT lists all locks acquired by every transaction on the system. It shows which sessions are holding DML locks (that is, TM-type enqueues) on what objects and in what mode.

Column Datatype Description
XIDUSN NUMBER Undo segment number
XIDSLOT NUMBER Slot number
XIDSQN NUMBER Sequence number
OBJECT_ID NUMBER Object ID being locked
SESSION_ID NUMBER Session ID
ORACLE_USERNAME VARCHAR2(30) Oracle user name
OS_USER_NAME VARCHAR2(30) Operating system user name
PROCESS VARCHAR2(24) Operating system process ID
LOCKED_MODE NUMBER Lock mode. The numeric values for this column map to these text values for the lock modes for table locks:
  • 0 - NONE: lock requested but not yet obtained

  • 1 - NULL

  • 2 - ROWS_S (SS): Row Share Lock

  • 3 - ROW_X (SX): Row Exclusive Table Lock

  • 4 - SHARE (S): Share Table Lock

  • 5 - S/ROW-X (SSX): Share Row Exclusive Table Lock

  • 6 - Exclusive (X): Exclusive Table Lock

See Also: Oracle Database Concepts for more information about lock modes for table locks

CON_ID NUMBER The ID of the container to which the data pertains. Possible values include:
  • 0: This value is used for rows containing data that pertain to the entire CDB. This value is also used for rows in non-CDBs.

  • 1: This value is used for rows containing data that pertain to only the root

  • n: Where n is the applicable container ID for the rows containing data