1、查询已经锁住的表
SELECT S.USERNAME, DECODE(L.TYPE, 'TM', 'TABLE LOCK', 'TX', 'ROW LOCK', NULL) LOCK_LEVEL, O.OWNER, O.OBJECT_NAME, O.OBJECT_TYPE, S.SID, S.SERIAL#, S.TERMINAL, S.MACHINE, S.PROGRAM, S.OSUSER FROM V$SESSION S, V$LOCK L, DBA_OBJECTS O WHERE L.SID = S.SID AND L.ID1 = O.OBJECT_ID(+) AND S.USERNAME IS NOT NULL

2、解表

--kill session语句 --'151,3027'格式：'SID,SERIAL#' ALTER SYSTEM KILL SESSION '151,3032';

3、相关表

--以下几个为相关表 SELECT * FROM V$LOCK; SELECT * FROM V$SQLAREA; SELECT * FROM V$SESSION; SELECT * FROM V$PROCESS; SELECT * FROM V$LOCKED_OBJECT; SELECT * FROM ALL_OBJECTS; SELECT * FROM V$SESSION_WAIT; --1.查出锁定object的session的信息以及被锁定的object名 SELECT L.SESSION_ID SID, S.SERIAL#, L.LOCKED_MODE, L.ORACLE_USERNAME, L.OS_USER_NAME, S.MACHINE, S.TERMINAL, O.OBJECT_NAME, S.LOGON_TIME FROM V$LOCKED_OBJECT L, ALL_OBJECTS O, V$SESSION S WHERE L.OBJECT_ID = O.OBJECT_ID AND L.SESSION_ID = S.SID ORDER BY SID, S.SERIAL#; --2.查出锁定表的session的sid, serial#,os_user_name, machine name, terminal和执行的语句 --比上面那段多出sql_text和action SELECT L.SESSION_ID SID, S.SERIAL#, L.LOCKED_MODE, L.ORACLE_USERNAME, S.USER#, L.OS_USER_NAME, S.MACHINE, S.TERMINAL, A.SQL_TEXT, A.ACTION FROM V$SQLAREA A, V$SESSION S, V$LOCKED_OBJECT L WHERE L.SESSION_ID = S.SID AND S.PREV_SQL_ADDR = A.ADDRESS ORDER BY SID, S.SERIAL#; --3.查出锁定表的sid, serial#,os_user_name, machine_name, terminal，锁的type,mode SELECT S.SID, S.SERIAL#, S.USERNAME, S.SCHEMANAME, S.OSUSER, S.PROCESS, S.MACHINE, S.TERMINAL, S.LOGON_TIME, L.TYPE FROM V$SESSION S, V$LOCK L WHERE S.SID = L.SID AND S.USERNAME IS NOT NULL ORDER BY SID; --如果发生了锁等待，我们可能更想知道是谁锁了表而引起谁的等待 --以下的语句可以查询到谁锁了表，而谁在等待。 --以上查询结果是一个树状结构，如果有子节点，则表示有等待发生。 --如果想知道锁用了哪个回滚段，还可以关联到V$rollname，其中xidusn就是回滚段的USN SELECT LPAD(' ', DECODE(L.XIDUSN, 0, 3, 0)) || L.ORACLE_USERNAME USER_NAME, O.OWNER, O.OBJECT_NAME, O.OBJECT_TYPE, S.SID, S.SERIAL# FROM V$LOCKED_OBJECT L, DBA_OBJECTS O, V$SESSION S WHERE L.OBJECT_ID = O.OBJECT_ID AND L.SESSION_ID = S.SID ORDER BY O.OBJECT_ID, XIDUSN DESC