查詢Oracle相關鎖語句

1.查找當前表級鎖的SQL以下：

select sess.sid, 

    sess.serial#, 

    lo.oracle_username, 

    lo.os_user_name, 

    ao.object_name, 

    lo.locked_mode 

    from v$locked_object lo, 

    dba_objects ao, 

    v$session sess 

where ao.object_id = lo.object_id and lo.session_id = sess.sid;

2.殺掉鎖表進程：

alter system kill session '436,35123';

3.RAC環境中鎖查找：

SELECT inst_id,DECODE(request,0,'Holder: ','Waiter: ')||sid sess, 

        id1, id2, lmode, request, type,block,ctime

FROM GV$LOCK

WHERE (id1, id2, type) IN

       (SELECT id1, id2, type FROM GV$LOCK WHERE request>0)

ORDER BY id1, request;

   

4.監控當前數據庫誰在運行什麼SQL語句 

select osuser, username, sql_text  

from  v$session a, v$sqltext b 

where  a.sql_address =b.address order by address, piece; 

 

5.找使用CPU多的用戶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; 

6.查看死鎖信息

SELECT (SELECT username

          FROM v$session

         WHERE SID = a.SID) blocker, a.SID, 'is blocking',

       (SELECT username

          FROM v$session

         WHERE SID = b.SID) blockee, b.SID

  FROM v$lock a, v$lock b

 WHERE a.BLOCK = 1 AND b.request > 0 AND a.id1 = b.id1 AND a.id2 = b.id2;

7.具備最高等待的對象

SELECT   o.OWNER,o.object_name, o.object_type, a.event,

         SUM (a.wait_time + a.time_waited) total_wait_time

    FROM v$active_session_history a, dba_objects o

   WHERE a.sample_time BETWEEN SYSDATE - 30 / 2880 AND SYSDATE

     AND a.current_obj# = o.object_id

GROUP BY o.OWNER,o.object_name, o.object_type, a.event

ORDER BY total_wait_time DESC;

SELECT   a.session_id, s.osuser, s.machine, s.program, o.owner, o.object_name,

         o.object_type, a.event,

         SUM (a.wait_time + a.time_waited) total_wait_time

    FROM v$active_session_history a, dba_objects o, v$session s

   WHERE a.sample_time BETWEEN SYSDATE - 30 / 2880 AND SYSDATE

     AND a.current_obj# = o.object_id

     AND a.session_id = s.SID

GROUP BY o.owner,

         o.object_name,

         o.object_type,

         a.event,

         a.session_id,

         s.program,

         s.machine,

         s.osuser

ORDER BY total_wait_time DESC;

 

8.查詢當前鏈接會話數

select s.value,s.sid,a.username

from 

v$sesstat S,v$statname N,v$session A

where 

n.statistic#=s.statistic# and

name='session pga memory'

and s.sid=a.sid

order by s.value;

 

9.等待最多的用戶

SELECT   s.SID, s.username, SUM (a.wait_time + a.time_waited) total_wait_time

    FROM v$active_session_history a, v$session s

   WHERE a.sample_time BETWEEN SYSDATE - 30 / 2880 AND SYSDATE

GROUP BY s.SID, s.username

ORDER BY total_wait_time DESC;

 

10.等待最多的SQL

SELECT   a.program, a.session_id, a.user_id, d.username, s.sql_text,

         SUM (a.wait_time + a.time_waited) total_wait_time

    FROM v$active_session_history a, v$sqlarea s, dba_users d

   WHERE a.sample_time BETWEEN SYSDATE - 30 / 2880 AND SYSDATE

     AND a.sql_id = s.sql_id

     AND a.user_id = d.user_id

GROUP BY a.program, a.session_id, a.user_id, s.sql_text, d.username;

 

11.查看消耗資源最多的SQL

SELECT hash_value, executions, buffer_gets, disk_reads, parse_calls

FROM V$SQLAREA

WHERE buffer_gets > 10000000 OR disk_reads > 1000000

ORDER BY buffer_gets + 100 * disk_reads DESC;

 

12.查看某條SQL語句的資源消耗

SELECT hash_value, buffer_gets, disk_reads, executions, parse_calls

FROM V$SQLAREA

WHERE hash_Value = 228801498 AND address = hextoraw('CBD8E4B0'); 

13.查詢會話執行的實際SQL

SELECT   a.SID, a.username, s.sql_text

    FROM v$session a, v$sqltext s

   WHERE a.sql_address = s.address

     AND a.sql_hash_value = s.hash_value

     AND a.status = 'ACTIVE'

ORDER BY a.username, a.SID, s.piece;

14.顯示正在等待鎖的全部會話

SELECT * FROM DBA_WAITERS;