oracle session or table lock

I am using Oracle 10g. Sometimes application got stuck due to deadlock. I want to find out from where it is got locked and other details of it. Is there any query for that to find it out?
siva_gkAsked:
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schwertnerConnect With a Mentor Commented:
REM PURPOSE:
REM    The report generated by this script gives information on sessions
REM    which are holding locks and gives the information needed to kill
REM    using the ALTER SYSTEM KILL SESSION command.
REM ------------------------------------------------------------------------
REM Main text of script follows:
 
set linesize 180 pagesize 66
break on Kill on username on terminal
column Kill heading 'Kill String' format a13
column res heading 'Resource Type' format 999
column id1 format 9999990
column id2 format 9999990
column lmode heading 'Lock Held' format a20
column request heading 'Lock Requested' format a20
column serial# format 99999
column username  format a10  heading "Username"
column terminal heading Term format a10
column OSuser heading OSuser format a15
column machine heading Machine format a10
column tab format a35 heading "Table Name"
column owner format a9
column Address format a18
select      nvl(S.USERNAME,'Internal') username,
      nvl(S.TERMINAL,'None') terminal,
        nvl(S.MACHINE,'None') machine,
        nvl(S.OSUSER,'None') OSuser,    
      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'
order by   username, terminal, machine, lmode
--order by 1,2,6
/



SHOWING ALSO THE SQL :


SET ECHO off
REM NAME:   TFSLKILL.SQL
REM USAGE:"@path/tfslkill"
REM ------------------------------------------------------------------------
REM REQUIREMENTS:
REM    SELECT on V$LOCK, V$SESSION, SYS.USER$, SYS.OBJ$
REM ------------------------------------------------------------------------
REM PURPOSE:
REM    The report generated by this script gives information on sessions
REM    which are holding locks and gives the information needed to kill
REM    using the ALTER SYSTEM KILL SESSION command.
REM ------------------------------------------------------------------------
REM Main text of script follows:
 
set linesize 300 pagesize 66
break on Kill on username on terminal
column Kill heading 'Kill String' format a13
column res heading 'Resource Type' format 999
column id1 format 9999990
column id2 format 9999990
column lmode heading 'Lock Held' format a20
column request heading 'Lock Requested' format a20
column serial# format 99999
column username  format a10  heading "Username"
column terminal heading Term format a10
column OSuser heading OSuser format a15
column machine heading Machine format a10
column tab format a35 heading "Table Name"
column owner format a9
column Address format a18
column sql format a135 heading "S  Q  L"
select      nvl(S.USERNAME,'Internal') username,
      nvl(S.TERMINAL,'None') terminal,
        nvl(S.MACHINE,'None') machine,
        nvl(S.OSUSER,'None') OSuser,    
      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,
        sql. sql_text SQL  
from      V$LOCK L,  
      V$SESSION S,
      SYS.USER$ U1,
      SYS.OBJ$ T1,
        v$sqltext sql
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     sql.hash_value=s.sql_hash_value  
order by   username, terminal, machine
--order by 1,2,6
/

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Richard OlutolaConsultantCommented:
Check the alert log which would point you to a trace file with all the details you require.

R.
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siva_gkAuthor Commented:
wow !!! thanks schwertner
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