DB - Oracle-system用戶經常使用SQL

鏈接數查看

           selectusername, t.MACHINE,count(username) 
         
           fromv$session t 
         
           whereusername ='DPMUSER'andstatus ='ACTIVE' 
         
           groupbyusername,t.MACHINE 
         
           orderbyMACHINE,count(username)desc;

鏈接登入狀況

           Selectt.LOGON_TIMEfromv$session twherestatus ='INACTIVE'ANDusername ='DPMUSER'ORDERBYT.LOGON_TIMEDESC; 
         

查看鎖

           selectowner,namemode_held,count(*) 
         
           fromdba_dml_locks 
         
           groupbyowner,name, mode_heldorderbyowner;

查看鎖

           SELECT/*+rule*/ 
         
           s.username, 
         
           decode(l.type,'TM','DML enqueue','TX','Transaction enqueue',NULL) LOCK_LEVEL, 
         
           o.owner, 
         
           o.object_name, 
         
           o.object_type, 
         
           s.sid, 
         
           s.serial#, 
         
           s. terminal, 
         
           s.machine, 
         
           s.program, 
         
           s.osuser 
         
           FROMv$session s, v$lock l, dba_objects o 
         
           WHEREl.sid = s.sid 
         
           ANDl.id1 = o.object_id(+) 
         
           ANDs.usernameisNOTNULL 
         
           orderbysid;

解鎖

           select'alter system kill session '''|| sid ||','|| serial# || 
         
           ''' IMMEDIATE;'--, 
         
           -- t.logon_time, t.* 
         
           fromv$session t 
         
           where/* t.logon_time > sysdate -10/24/60 
         
           and*/ 
         
           username ='MEMBERUSER';

檢查是否有block的session

           select*fromdba_blockers; 
         
           select*fromdba_waiters;