Oracle 动态视图2 V$LOCKED_OBJECT

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：

 --对表 t1 加锁

 SQL> select * from t1 for update ;

 --查看v$locked_object
 SQL> SELECT OBJECT_ID,SESSION_ID,LOCKED_MODE FROM V$LOCKED_OBJECT;

  OBJECT_ID SESSION_ID LOCKED_MODE
 ---------- ---------- -----------
      53252        134           3

 SQL>

 --查看持有锁的会话，及被锁对象名称
 SQL> SELECT T2.USERNAME, T2.SID, T2.SERIAL#, T3.object_name,T2.LOGON_TIME
   2  FROM V$LOCKED_OBJECT T1, V$SESSION T2, DBA_OBJECTS T3
   3  WHERE T1.object_id = T3.object_id and T1.session_id = T2.sid
   4  ORDER BY T2.LOGON_TIME;

 USERNAME          SID    SERIAL# OBJECT_NAME     LOGON_TIM
 ---------- ---------- ---------- --------------- ---------
 SYS               134        496 T1              12-AUG-13