Oracle中锁（lock）的用法(2)-木庄网络博客

alter system kill session'494,7355';

二、一个有用查找脚本：

1、找到某表的锁所属的sid，alter system kill session 'sid,serial#';即可

select v$lock.sid, decode(v$lock.type, 'MR', 'Media Recovery', 'RT', 'Redo Thread', 'UN', 'User Name', 'TX', 'Transaction', 'TM', 'DML', 'UL', 'PL/SQL User Lock', 'DX', 'Distributed Xaction', 'CF', 'Control File', 'IS', 'Instance State', 'FS', 'File Set', 'IR', 'Instance Recovery', 'ST', 'Disk Space Transaction', 'TS', 'Temp Segment', 'IV', 'Library Cache Invalida-tion', 'LS', 'Log Start or Switch', 'RW', 'Row Wait', 'SQ', 'Sequence Number', 'TE', 'Extend Table', 'TT', 'Temp Table', 'Unknown') LockType, rtrim(owner) || '.' ||
        object_name object_name, decode(lmode, 0, 'None', 1, 'Null', 2, 'Row-S', 3, 'Row-X', 4, 'Share', 5, 'S/Row-X', 6, 'Exclusive', 'Unknown') LockMode, decode(request, 0, 'None', 1, 'Null', 2, 'Row-S', 3, 'Row-X', 4, 'Share', 5, 'S/Row-X', 6, 'Exclusive', 'Unknown') RequestMode, ctime, block b
from v$lock, all_objects
where sid > 6
and v$lock.id1 = all_objects.object_id;

2、查出被lock 的对象，然后 alter system kill session 'sid,serial#';

select object_id, session_id, serial#, oracle_username, os_user_name, s.process
from v$locked_object a, v$session s
where a.session_id = s.sid;

三、LOCK TABLE

1、语法：

LOCK   TABLE   table_1   [,table_2,   ...,   table_n]   IN   lock_mode   MODE
  NOWAIT

2、变量：

table_1,...,table_n: 一系列你想通过使用LOCK TABLE语句锁住的数据库表。

lock_mode: 对于某一数据库表你要设定的锁定模式。你可以从如下的锁定模式中任选一个。

EXCLUSIVE
SHARE ROW EXCLUSIVE
SHARE
SHARE UPDATE
ROW SHARE
ROW EXCLUSIVE

NOWAIT: Oracle will not wait to lock the given Table(s), if the Table(s) is(are) not available

3、例子：

LOCK   TABLE   loan     IN   SHARE   MODE   ;
LOCK   TABLE   region   IN   EXCLUSIVE   MODE   NOWAIT;
LOCK   TABLE   acct     IN   SHARE   UPDATE   MODE;
LOCK   TABLE   bank     IN   ROW   EXCLUSIVE   MODE   NOWAIT;
LOCK   TABLE   user     IN   SHARE   ROW   EXCLUSIVE   MODE;
LOCK   TABLE   branch   IN   ROW   SHARE   MODE   NOWAIT;
commit

到此这篇关于Oracle锁（lock）的文章就介绍到这了。希望对大家的学习有所帮助，也希望大家多多支持。

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