Killing a oracle session

Question

Hi,
I run a oracle query which has gone to deadlock.now i want to kill that session because it's happening frequently.How can i kill my own oracle process without needed DBA privs.
Regards
Anand

Answer 1

Do not confuse between deadlock and hang.
See the difference.
Here a deadlock :
Session 1:
SCOTT@demo102> select empno, ename from emp25;
     EMPNO ENAME
      7369 SMITH
      7499 ALLEN
      7521 WARD
      7566 JONES
      7654 MARTIN
      7698 BLAKE
      7782 CLARK
      7788 SCOTT
      7839 KING
      7844 TURNER
      7876 ADAMS
     EMPNO ENAME
      7900 JAMES
      7902 FORD
      7934 MILLER
14 rows selected.
SCOTT@demo102> begin
  2                update emp25 set ename = 'TEST' where empno=7369;
  3                dbms_lock.sleep(10);
  4                update emp25 set ename = '2' where empno=7499;
  5            end;
  6  /
PL/SQL procedure successfully completed.
SCOTT@demo102> Session 2:
SCOTT@demo102> l
  1  begin
  2      update emp25 set ename = 'TEST' where empno=7499;
  3      dbms_lock.sleep(10);
  4      update emp25 set ename = '2' where empno=7369;
  5* end;
SCOTT@demo102> /
begin
ERROR at line 1:
ORA-00060: deadlock detected while waiting for resource
ORA-06512: at line 4
SCOTT@demo102> As you can see above, there is no wait, neither of both session hang, so you don't need to kill one of them.
Here a hang session :
Session 1:
SCOTT@demo102> update emp25 set ename = 'TEST' where empno=7369;
1 row updated.
SCOTT@demo102> Session 2:
SCOTT@demo102> update emp25 set ename = 'TEST' where empno=7369;=> Wait event (commit/rollback) from session 1.
If user which is owner of session1 go at home, session 2 will wait all the week-end.
You need a third session to unblock situation :
SYS@DEMO102> DECLARE  
  2     CURSOR lcobj_cur IS
  3        select session_id
  4        ,      oracle_username
  5        ,      os_user_name
  6        ,      object_id obj_id
  7        ,      locked_mode
  8        from   V$LOCKED_OBJECT;
  9       
10     CURSOR obj_cur(p_obj_id IN NUMBER) IS
11        select owner||'.'||object_name object_name
12        ,      object_type
13        from dba_objects
14        where object_id = p_obj_id;
15     l_sid    number;
16     l_serial number;
17  BEGIN
18     DBMS_OUTPUT.PUT_LINE(RPAD('Sid',5)||
19                          RPAD('Serial',8)||
20                          RPAD('O-User',10)||
21                          RPAD('OS-User',10)||
22                          RPAD('Owner.Object Name',45)||
23                          RPAD('Object Type',35));
24 
25     DBMS_OUTPUT.PUT_LINE(RPAD('-',1,'-')||
26                          RPAD('-',1,'-')||
27                          RPAD('-',6,'-')||
28                          RPAD('-',6,'-')||
29                          RPAD('-',41,'-')||
30                          RPAD('-',31,'-'));
31 
32     FOR lcobj IN lcobj_cur
33     LOOP
34        FOR obj IN obj_cur(lcobj.obj_id)
35        LOOP
36           select distinct sid, serial# into l_sid, l_serial from v$session where sid= lcobj.session_id;
37           DBMS_OUTPUT.PUT_LINE(RPAD(lcobj.session_id,5)||
38                                RPAD(l_serial,8)||
39                                RPAD(lcobj.oracle_username,10)||
40                                RPAD(lcobj.os_user_name,10)||
41                                RPAD(obj.object_name,45)||
42                                RPAD(obj.object_type,35));
43        END LOOP;
44     END LOOP;
45  END;
46  /
Sid  Serial  O-User    OS-User   Owner.Object Name                            Object Type
147  121     SCOTT     INKASHI\AdSCOTT.EMP25                                  TABLE
152  18      SCOTT     INKASHI\AdSCOTT.EMP25                                  TABLE
PL/SQL procedure successfully completed.
SYS@DEMO102>
SYS@DEMO102> select /*+ ORDERED */
  2     blocker.sid blocker_sid
  3  ,  blocked.sid blocked_sid
  4  ,  TRUNC(blocked.ctime/60) min_blocked
  5  ,  blocked.request
  6  from (select *
  7        from v$lock
  8        where block != 0
  9        and type = 'TX') blocker
10  ,    v$lock            blocked
11  where blocked.type='TX'
12  and blocked.block = 0
13  and blocked.id1 = blocker.id1
14  /
BLOCKER_SID BLOCKED_SID MIN_BLOCKED    REQUEST
        152         147           4          6
SYS@DEMO102>
SYS@DEMO102> alter system kill session '152,18';
System altered.
SYS@DEMO102> Then session1 will be disconnected :
SCOTT@demo102> select * from emp25;
select * from emp25
ERROR at line 1:
ORA-00028: your session has been killed
SCOTT@demo102> And session2 can continue his work :
1 row updated.
SCOTT@demo102> select * from emp25;
     EMPNO ENAME      JOB              MGR HIREDATE        SAL       COMM
    DEPTNO
      7369 TEST       CLERK           7902 17/12/80       8000
        20
...Hope this help,
Nicolas.