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Monday 2 March 2015

Identify Oracle Database Locks

The below SQL gives the list of locks on the Database Objects and the corresponding Terminal

select nvl(S.USERNAME,'Internal') username,
       nvl(S.TERMINAL,'None') terminal,
       L.SID||','||S.SERIAL# Kill,
       U1.NAME||'.'||substr(T1.NAME,1,20) tab,
       decode(L.LMODE,1,'No Lock',
                      2,'Row Share',
                      3,'Row Exclusive',
                      4,'Share',
                      5,'Share Row Exclusive',
                      6,'Exclusive',null) lmode,
       decode(L.REQUEST,1,'No Lock',
                       2,'Row Share',
                       3,'Row Exclusive',
                       4,'Share',
                       5,'Share Row Exclusive',
                       6,'Exclusive',null) request
 from V$LOCK L,
      V$SESSION S,
      SYS.USER$ U1,
      SYS.OBJ$ T1
where L.SID = S.SID
  and T1.OBJ# = decode(L.ID2,0,L.ID1,L.ID2)
  and U1.USER# = T1.OWNER#
  and S.TYPE != 'BACKGROUND'
  and S.sid in(select blocking_session from v$session where blocking_session is not null)
order by 1,2,5


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