v$locked_object视图列出当前系统中哪些对象正被锁定
| Column | Datatype | Description |
| XIDUSN | NUMBER | 回滚段号 |
| XIDSLOT | NUMBER | 槽号 |
| XIDSQN | NUMBER | 序列号 |
| OBJECT_ID | NUMBER | 被锁对象ID |
| SESSION_ID | NUMBER | 持有锁的会话ID |
| ORACLE_USERNAME | VARCHAR2(30) | 持有锁的Oracle用户名 |
| OS_USER_NAME | VARCHAR2(30) | 持有锁的系统用户名 |
| PROCESS | VARCHAR2(12) | 操作系统进程号 |
| LOCKED_MODE | NUMBER | 锁模式 |
示例：
1 --对表 t1 加锁 2 3 SQL> select * from t1 for update ; 4 5 --查看v$locked_object 6 SQL> SELECT OBJECT_ID,SESSION_ID,LOCKED_MODE FROM V$LOCKED_OBJECT; 7 8 OBJECT_ID SESSION_ID LOCKED_MODE 9 ---------- ---------- ----------- 10 53252 134 3 11 12 SQL> 13 14 --查看持有锁的会话，及被锁对象名称 15 SQL> SELECT T2.USERNAME, T2.SID, T2.SERIAL#, T3.object_name,T2.LOGON_TIME 16 2 FROM V$LOCKED_OBJECT T1, V$SESSION T2, DBA_OBJECTS T3 17 3 WHERE T1.object_id = T3.object_id and T1.session_id = T2.sid 18 4 ORDER BY T2.LOGON_TIME; 19 20 USERNAME SID SERIAL# OBJECT_NAME LOGON_TIM 21 ---------- ---------- ---------- --------------- --------- 22 SYS 134 496 T1 12-AUG-13