Oracle session

Oracle session

参考网址:http://www./articles/misc/killing-oracle-sessions.php

            http://junsansi./post/29894/292558

            http://blog.csdn.net/tianlesoftware/article/details/7412555

　　　　http://blog.csdn.net/tianlesoftware/article/details/7417058

1、查询用户相关的session的ID和session的序列号，这里没有显示系统用户的，因为系统用户在V$SESSION的表里面的

USERNAME为空，只可以通过关联ALL_USERS表，通过user#和user_id相关联。

1 SELECT USERNAME || '(' || SID || ',' || SERIAL# || ')' USERNAME,
2        MODULE,
3        ACTION,
4        CLIENT_INFO
5   FROM V$SESSION
6  WHERE MODULE || ACTION || CLIENT_INFO IS NOT NULL

--关联用户表，查询出用户的名字。

1 SELECT AU.USERNAME, V.ACTION, V.SID
2   FROM V$SESSION V
3   LEFT JOIN ALL_USERS AU
4     ON AU.USER_ID = V.USER#
5  ORDER BY AU.USERNAME;

2、查询session视图中的SQL_ID对应的SQL语句:

1 SELECT VS.SQL_TEXT
2   FROM V$SESSION V
3   LEFT JOIN V$SQL VS
4     ON V.SQL_ID = VS.SQL_ID

3、查询当前的锁模式：

当前的用户为空，代表为系统用户，要显示系统用户的名字，可以通过v$session中的user#与all_users的user_id相关联，来显示用户名字:

 1 SELECT SESSION_ID      "SID",
 2        LOCK_TYPE       "Lock Type",
 3        MODE_HELD       "Mode Held",
 4        BLOCKING_OTHERS "Blocking?",
 5        V.USERNAME, --为空,代表为系统用户
 6        V.MACHINE,
 7        V.ACTION
 8   FROM DBA_LOCKS DL
 9   LEFT JOIN V$SESSION V
10     ON V.SID = DL.SESSION_ID

4、查询出相应的统计资料:包括登录次数，回滚次数，提交次数等等:

1 SELECT NAME, VALUE FROM V$SYSSTAT

5、查询出死锁的次数：

1 select name, value
2   from v$sysstat
3 where name = 'enqueue deadlocks';

6、查看被锁定的对象

1 SELECT * FROM V$LOCKED_OBJECT;

可以查询出OBJECT_ID和SESSION_ID分别和V$SESSION和USER_OBJECT关联查询更具体的信息。

1 SELECT * FROM v$session t WHERE t.SID = '139';--根据会话ID查询
2 SELECT * FROM USER_OBJECTS U WHERE U.OBJECT_ID = '61151';--根据OBJECT_ID查询

7、KILL_SESSION

注意：BLOCK表示的是阻塞的

        TYPE != 'BACKGROUND'表示防止杀死系统进程

1 SELECT 'alter system kill session ''' || SID || ',' || SERIAL# || ''';' "Deadlock"
2   FROM V$SESSION
3  WHERE SID IN (SELECT SID FROM V$LOCK WHERE BLOCK = 1)
4    AND TYPE != 'BACKGROUND';

8、查询死锁的SQL语句，&sid为上面查出的ID，查询出的死锁的会话ID

1 SELECT s.sid, q.sql_text
2   FROM v$sqltext q, v$session s
3  WHERE q.address = s.sql_address
4    AND s.sid = &sid

9、查看锁住对象，所有者，类型，会话ID

1 SELECT o.owner, o.object_name, o.object_type, s.sid, s.serial#
2   FROM v$locked_object l, dba_objects o, v$session s
3  WHERE l.object_id = o.object_id
4    AND l.session_id = s.sid
5  ORDER BY o.object_id, xidusn DESC

10、查询非系统进程，和进行操作的语句和他的类型和他的事件

1 SELECT v.sql_text, v.sql_fulltext, t.action, t.type, t.event, t.*
2   FROM v$session t
3   LEFT JOIN v$sql v
4     ON v.sql_id = t.sql_id
5  WHERE t.type != 'BACKGROUND'

11、杀掉会话可以采用两种方式：

1 alter system kill session 'sid,serial#' immediate;--使用immediate关键字
2 alter system kill session 'sid,serial#';

注意:

 被标记为killed 的进程由PMON 进程kill，但是这个也是有条件的：

PMON will notdelete the session object itself until the client connected to that sessionnotices that it has been killed.

12、使用系统命令杀掉进程：操作系统级别的杀掉会话

windows命令:

To kill the session on the Windows operating system, first identify the session, then substitute the relevant SID and SPID values into the following command issued from the command line.

1 C:> orakill ORACLE_SID(数据库实例名) spid(v$process表中获取)

测试:

1 SELECT Spid, Osuser, s.Program
2   FROM V$session s, V$process p
3  WHERE s.Paddr = p.Addr
4    AND s.Sid = 137;

 

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