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-- Some formatting
SET LINESIZE 180
SET PAGESIZE 200
COLUMN owner FORMAT A20
COLUMN username FORMAT A20
COLUMN object_owner FORMAT A20
COLUMN object_name FORMAT A30
COLUMN lock_mode FORMAT A15
COLUMN machine FORMAT A20
 
-- Query locked objects
SELECT lo.session_id AS sid,
       s.serial#,
       NVL(lo.oracle_username, '(oracle)') AS username,
       o.owner AS object_owner,
       o.object_name,
       DECODE(lo.locked_mode, 0, 'None',
                             1, 'Null (NULL)',
                             2, 'Row-S (SS)',
                             3, 'Row-X (SX)',
                             4, 'Share (S)',
                             5, 'S/Row-X (SSX)',
                             6, 'Exclusive (X)',
                             lo.locked_mode) lock_mode,
       lo.os_user_name,
       s.machine
FROM   v$locked_object lo
       JOIN dba_objects o ON o.object_id = lo.object_id
       JOIN v$session s ON lo.session_id = s.sid
ORDER BY 1, 2, 3, 4;