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