DBA常用SQL之会话与等待事件

SELECT *
  FROM V$SESSION
 WHERE USERNAME IS NOT NULL
   AND STATUS = 'ACTIVE'
 ORDER BY LOGON_TIME, SID;

1.查询会话

SELECT P.SPID,
       S.SID,
       S.OSUSER,
       S.MACHINE,
       S.PROGRAM,
       S.LOGON_TIME,
       Q.MODULE,
       S.SERIAL#,
       Q.SQL_ID,
       Q.SQL_TEXT,
       Q.SQL_FULLTEXT
  FROM V$PROCESS P
 INNER JOIN V$SESSION S
    ON P.ADDR = S.PADDR
 INNER JOIN V$SQLAREA Q
    ON S.SQL_ID = Q.SQL_ID
 WHERE S.AUDSID = USERENV('SESSIONID');  --查询当前会话

2.查询会话与对应的进程

3.Wait_time和Second_in_wait字段值与state相关:
　　(1)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)。
　　(2)如果state值为Wait unknow time，那么wait_time值和Second_in_wait值都无用。
　　(3)如果state值为Wait short time，那么wait_time值和Second_in_wait值都无用。
　　(4)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。

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
 ;

3.查询会话等待与对应的SQL

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
 ;
 

4.查询会话等待事件与对应SQL

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
 ;
 

5.查询长时间运行的会话与对应的SQL

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; 

6.查询会话及锁与对应的SQL

select t2.username,
       t2.sid,
       t2.serial#,
       t3.object_name,
       t2.OSUSER,
       t2.MACHINE,
       t2.PROGRAM,
       t2.LOGON_TIME,
       t2.COMMAND,
       t2.LOCKWAIT,
       t2.SADDR,
       t2.PADDR,
       t2.TADDR,
       t2.SQL_ADDRESS,
       t1.LOCKED_MODE
  from v$locked_object t1, v$session t2, dba_objects t3,v$sql t4
 where t1.session_id = t2.sid
   and t1.object_id = t3.object_id
  --- and t2.SADDR=t4.ADDRESS(+)

   and t2.sql_id=t4.sql_id
 order by t2.logon_time

alter system kill session '139, 182'
139 : sid  182 : sertal#

6.1查询会话及锁与对应SQL

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
  ;

6.2查询阻塞会话与被阻塞会话的对应SQL