oracle数据库锁定与解锁

查看锁定项：表锁定、行锁定等，如下代码

SELECT /*+ rule */ 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

解锁语句如下

alter system kill session'sid,serial';

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;

这个语句将查找到数据库中所有的DML语句产生的锁，还可以发现，

任何DML语句其实产生了两个锁，一个是表锁，一个是行锁。

杀锁命令

alter system kill session 'sid,serial#'

SELECT /*+ rule */ 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

合并锁定项及批量导出语句方法如下：

SET ECHO ON                                  -------是否显示执行的命令内容
SET FEEDBACK OFF                      --------是否显示* rows selected
SET HEADING OFF                          --------是否显示字段名称
SET VERIFY OFF                              ---------是否显示替代变量被替代前后的语句。
SET TRIMSPOOL ON                       --------去字段空格
SET PAGESIZE 1000                       --------页面大小
SET LINESIZE 50                             --------尽量根据需要来定，生成文件大小
DEFINE FIL='D:\EXP.TXT'
PROMPT * * * SPOOLING TO &FIL
SPOOL ON
SPOOL &FIL
select 'alter system kill session ',''''||trim(t2.sid)||','||trim(t2.serial#)||''';'
from v$locked_object t1,v$session t2 where t1.session_id=t2.sid order by t2.logon_time;//该部分只查询出SID和serial#值；
SPOOL OFF

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

col user_name format a10

col owner format a10

col object_name format a10

col object_type format a10

SELECT /*+ rule */ 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