Oracle 查看session级别信息

Posted 2020-10-14 ClarkYu

1. 查看活动会话信息
[sql] view plain copy
SELECT *  
  FROM V$SESSION  
 WHERE USERNAME IS NOT NULL  
   AND STATUS = ‘ACTIVE‘  
 ORDER BY LOGON_TIME, SID;  


注：status用来判断会话状态
       Active：正执行sql语句(waiting for/using a resource)
       Inactive：等待操作(即等待需要执行的sql语句)
       killed：被标记为删除
  
2. 查看当前会话执行的sql语句及进程信息
[sql] view plain copy
SELECT P.SPID,  
       S.SID,  
       S.OSUSER,  
       S.MACHINE,  
       S.PROGRAM,  
       S.LOGON_TIME,  
       S.SERIAL#,  
       Q.MODULE,  
       Q.SQL_ID,  
       Q.SQL_TEXT,  
       Q.SQL_FULLTEXT  
  FROM V$SESSION S, V$PROCESS P, V$SQLAREA Q  
 WHERE S.PADDR = P.ADDR(+)  
   AND S.SQL_ID = Q.SQL_ID(+)  
   AND S.AUDSID = USERENV(‘SESSIONID‘);  
else:获取当前会话的SID
[sql] view plain copy
SELECT * FROM V$SESSION  WHERE AUDSID = USERENV(‘SESSIONID‘);  
  
SELECT * FROM V$MYSTAT A WHERE ROWNUM=1;  
  
SELECT USERENV(‘SID‘) FROM DUAL;  


3. 查询会话等待与其对应的sql
[sql] view plain copy
SELECT P.PID,  
       S.SID,  
       S.SERIAL#,  
       S.USERNAME,  
       Q.SQL_ID,  
       Q.SQL_TEXT,  
       Q.SQL_FULLTEXT,  
       W.EVENT,  
       W.WAIT_TIME,  
       W.STATE,  
       CASE  
         WHEN W.STATE = ‘WAITING‘ THEN  
          W.SECONDS_IN_WAIT  
         WHEN W.STATE = ‘WAITING KNOWN TIME‘ THEN  
          W.WAIT_TIME  
       END AS SEC_IN_WAIT  
  FROM V$SESSION S, V$SESSION_WAIT W, V$SQLAREA Q, V$PROCESS P  
 WHERE S.SID = W.SID  
   AND S.SQL_ID = Q.SQL_ID  
   AND P.ADDR = S.PADDR  
   AND W.EVENT NOT LIKE ‘SQL*Net%‘  
   AND S.USERNAME IS NOT NULL  
   AND W.WAIT_TIME >= 0  
 ORDER BY W.SECONDS_IN_WAIT DESC;  
注： 如果state值为Waiting，那么wait_time值无用。Second_in_wait值是实际的等待时间(单位：秒)。
         如果state值为Wait unknow time，那么wait_time值和Second_in_wait值都无用。
         如果state值为Wait short time，那么wait_time值和Second_in_wait值都无用。
         如果state值为Waiting known time，那么wait_time值就是实际等待时间(单位：秒)，Second_in_wait值无用。
 
4. 查询会话等待事件及对应的sql
[sql] view plain copy
SELECT P.PID,  
       S.SID,  
       S.SERIAL#,  
       S.USERNAME,  
       Q.SQL_ID,  
       Q.SQL_TEXT,  
       Q.SQL_FULLTEXT,  
       E.EVENT,  
       E.TOTAL_WAITS,  
       E.TIME_WAITED,  
       E.AVERAGE_WAIT  
  FROM V$SESSION S, V$SESSION_EVENT E, V$SQLAREA Q, V$PROCESS P  
 WHERE S.SID = E.SID  
   AND S.SQL_ID = Q.SQL_ID  
   AND P.ADDR = S.PADDR  
   AND E.EVENT NOT LIKE ‘SQL*Net%‘  
   AND S.STATUS = ‘ACTIVE‘  
   AND S.USERNAME IS NOT NULL;  


5. 查询长时间运行的会话与对应的sql
[sql] view plain copy
SELECT S.SID,  
       OPNAME,  
       TRUNC(L.SOFAR / L.TOTALWORK * 100, 2) || ‘%‘ AS PCT_WORK,  
       L.ELAPSED_SECONDS ELAPSED,  
       ROUND(L.ELAPSED_SECONDS * (L.TOTALWORK - L.SOFAR) / L.SOFAR) REMAIN_TIME,  
       Q.SQL_TEXT  
  FROM V$SESSION_LONGOPS L, V$SQLAREA Q, V$SESSION S  
 WHERE L.SQL_HASH_VALUE = Q.HASH_VALUE  
   AND L.SID = S.SID  
   --AND L.SOFAR != L.TOTALWORK  
   AND L.ELAPSED_SECONDS>6  
 ORDER BY L.START_TIME  


6. 查询会话及锁与对应的sql
[sql] view plain copy
SELECT A.OWNER 方案名,  
       A.OBJECT_NAME 表名,  
       B.XIDUSN 回滚段号,  
       B.XIDSLOT 槽号,  
       B.XIDSQN 序列号,  
       B.SESSION_ID 锁表SESSION_ID,  
       B.ORACLE_USERNAME 锁表用户名,  
       DECODE(D.TYPE,  
              ‘XR‘,  
              ‘NULL‘,  
              ‘RS‘,  
              ‘SS(Row-S)‘,  
              ‘CF‘,  
              ‘SS(Row-S)‘,  
              ‘TM‘,  
              ‘TABLE LOCK‘,  
              ‘PW‘,  
              ‘TABLE LOCK‘,  
              ‘TO‘,  
              ‘TABLE LOCK‘,  
              ‘TS‘,  
              ‘TABLE LOCK‘,  
              ‘RT‘,  
              ‘ROW LOCK‘,  
              ‘TX‘,  
              ‘ROW LOCK‘,  
              ‘MR‘,  
              ‘S(Share)‘,  
              NULL) 锁定方式,  
       C.MACHINE 用户组,  
       C.TERMINAL 机器名,  
       B.OS_USER_NAME 系统用户名,  
       B.PROCESS 系统进程ID,  
       DECODE(C.STATUS, ‘INACTIVE‘, ‘不活动‘, ‘ACTIVE‘, ‘活动‘) 活动情况,  
       C.SERVER,  
       C.SID,  
       E.SQL_TEXT,  
       C.SERIAL#,  
       C.PROGRAM 连接方式,  
       C.LOGON_TIME  
  FROM ALL_OBJECTS     A,  
       V$LOCKED_OBJECT B,  
       SYS.GV_$SESSION C,  
       V$LOCK          D,  
       V$SQLTEXT       E  
 WHERE (A.OBJECT_ID = B.OBJECT_ID)  
   AND (B.PROCESS = C.PROCESS)  
   AND C.SID = D.SID  
   AND B.LOCKED_MODE = D.LMODE  
   AND C.SQL_ID = E.SQL_ID(+)  
 ORDER BY 1, 2;  


7. 查询被阻塞会话与被阻塞会话的对应sql
[sql] view plain copy
SELECT S1.USERNAME "WAITING USER",  
       S1.OSUSER   "OS User"  
         
       ,  
       S1.LOGON_TIME "logon time",  
       W.SESSION_ID  "Sid",  
       P1.SPID       "PID",  
       Q1.SQL_TEXT   "SQLTEXT",  
       S2.USERNAME   "HOLDING User",  
       S2.OSUSER     "OS User"  
         
       ,  
       S2.LOGON_TIME "logon time",  
       H.SESSION_ID  "Sid",  
       P2.SPID       "PID",  
       Q2.SQL_TEXT   "SQLTEXT"  
  FROM SYS.V_$PROCESS P1,  
       SYS.V_$PROCESS P2,  
       SYS.V_$SESSION S1,  
       SYS.V_$SESSION S2,  
       DBA_LOCKS      W,  
       DBA_LOCKS      H,  
       V$SQL          Q1,  
       V$SQL          Q2  
 WHERE H.MODE_HELD != ‘None‘  
   AND H.MODE_HELD != ‘Null‘  
   AND W.MODE_REQUESTED != ‘None‘  
   AND W.LOCK_TYPE(+) = H.LOCK_TYPE  
   AND W.LOCK_ID1(+) = H.LOCK_ID1  
   AND W.LOCK_ID2(+) = H.LOCK_ID2  
   AND W.SESSION_ID = S1.SID(+)  
   AND H.SESSION_ID = S2.SID(+)  
   AND S1.PADDR = P1.ADDR(+)  
   AND S2.PADDR = P2.ADDR(+)  
   AND S1.SQL_ID = Q1.SQL_ID(+)  
   AND S2.SQL_ID = Q2.SQL_ID(+)  
 ORDER BY H.SESSION_ID;  
 
 
 
 
 
1.通过如下sql你可以查询你的每个应用程序到底在等待什么，从而针对这些信息对数据库的性能进行调整。
Select s.username,s.program,s.status,se.event,se.total_waits,se.total_timeouts,se.time_waited,se.average_wait 
from v$session s, v$session_event se
Where s.sid=se.sid  And se.event not like ‘SQl*Net%‘  And s.status =‘ACTIVE‘  And s.username is not null


2.oracle中查询被锁的表并释放session
SELECT A.OWNER,A.OBJECT_NAME,B.XIDUSN,B.XIDSLOT,B.XIDSQN,B.SESSION_ID,B.ORACLE_USERNAME, B.OS_USER_NAME,B.PROCESS, B.LOCKED_MODE, C.MACHINE,C.STATUS,C.SERVER,C.SID,C.SERIAL#,C.PROGRAM
FROM ALL_OBJECTS A,V$LOCKED_OBJECT B,SYS.GV_$SESSION C 
WHERE ( A.OBJECT_ID = B.OBJECT_ID ) AND (B.PROCESS = C.PROCESS ) ORDER BY 1,2 
释放session Sql:
alter system kill session ‘sid, serial#‘
alter system kill session ‘379, 21132‘
alter system kill session ‘374, 6938‘


3.查看占用系统io较大的session
SELECT se.sid,se.serial#,pr.SPID,se.username,se.status,se.terminal,se.program,se.MODULE,se.sql_address,st.event,st.p1text,si.physical_reads,si.block_changes 
FROM v$session se,　v$session_wait st,v$sess_io si,v$process pr 
WHERE st.sid=se.sid 　AND st.sid=si.sid AND se.PADDR=pr.ADDR AND se.sid>6　AND st.wait_time=0 AND st.event NOT LIKE ‘%SQL%‘ ORDER BY physical_reads DESC


4.找出耗cpu较多的session
select a.sid,spid,status,substr(a.program,1,40) prog,a.terminal,osuser,value/60/100 value 
    from v$session a,v$process b,v$sesstat c 
    where c.statistic#=12 and c.sid=a.sid and a.paddr=b.addr order by value desc


5.查询session被锁的sql可以用一下语句 
select sys.v_$session.osuser,sys.v_$session.machine,v$lock.sid,
　　sys.v_$session.serial#,
　　decode(v$lock.type,
　　‘MR‘, ‘Media Recovery‘,
　　‘RT‘,‘Redo Thread‘,
　　‘UN‘,‘User Name‘,
　　‘TX‘, ‘Transaction‘,
　　‘TM‘, ‘DML‘,
　　‘UL‘, ‘PL/SQL User Lock‘,
　　‘DX‘, ‘Distributed Xaction‘,
　　‘CF‘, ‘Control File‘,
　　‘IS‘, ‘Instance State‘,
　　‘FS‘, ‘File Set‘,
　　‘IR‘, ‘Instance Recovery‘,
　　‘ST‘, ‘Disk Space Transaction‘,
　　‘TS‘, ‘Temp Segment‘,
　　‘IV‘, ‘Library Cache Invalida-tion‘,
　　‘LS‘, ‘Log Start or Switch‘,
　　‘RW‘, ‘Row Wait‘,
　　‘SQ‘, ‘Sequence Number‘,
　　‘TE‘, ‘Extend Table‘,
　　‘TT‘, ‘Temp Table‘,
　　‘Unknown‘) LockType,
　　rtrim(object_type) || ‘ ‘ || rtrim(owner) || ‘.‘ || object_name object_name,
　　decode(lmode, 0, ‘None‘,
　　1, ‘Null‘,
　　2, ‘Row-S‘,
　　3, ‘Row-X‘,
　　4, ‘Share‘,
　　5, ‘S/Row-X‘,
　　6, ‘Exclusive‘, ‘Unknown‘) LockMode,
　　decode(request, 0, ‘None‘,
　　1, ‘Null‘,
　　2, ‘Row-S‘,
　　3, ‘Row-X‘,
　　4, ‘Share‘,
　　5, ‘S/Row-X‘,
　　6, ‘Exclusive‘, ‘Unknown‘) RequestMode,
　　ctime, block b
　　from v$lock, all_objects, sys.v_$session
　　where v$Lock.sid > 6
　　and sys.v_$session.sid = v$lock.sid
　　and v$lock.id1 = all_objects.object_id;