Steps to resolve locks on database

Error Message:Could Not Reserve Records Due to Database Record Lock

1. Identify the Oracle serial ID, SID ID and terminate without shutting the
database down.

1.1 Make sure that the user is logged off.

1.1.1 Type ps -ef |grep

1.1.2 Kill all processes related to that user.

1.2 Identify SID, serial#

select distinct
acc.object, ses.osuser, ses.process,
ses.sid, ses.serial#
from v$access acc,
v$session ses
where (acc.owner != 'SYS'
or acc.object = 'PLAN_TABLE')
and acc.sid = ses.sid
and ses.status != 'INACTIVE'
and ses.type != 'BACKGROUND'
and acc.object not in ('V$ACCESS','V$SESSION')
and ses.audsid != userenv('SESSIONID')
order by 1,2,3
/

1.3. Double-check the identified SID and serial ID:

SELECT osuser,
username,
process,
sid,
serial#,
status,
to_char(logon_time,'DD-MON HH24:MI:SS') logon_time,
machine,
program
FROM v$session
WHERE sid = &SID_NUM
/

1.4. ALTER SYSTEM KILL SESSION '&SID_NUM,&SERIAL_NUM';
Alternatively use the following scripts to identify the blocking session:

-- check for locked tables
select a.object_id, a.session_id, substr(b.object_name, 1, 40)
from v$locked_object a,
dba_objects b
where a.object_id = b.object_id
order by b.object_name ;

--find_blocked.sql
select sid,
decode(block ,0,'NO','YES') BLOCKER,
decode(request,0,'NO','YES') WAITER
from v$lock
where request > 0 or block > 0 order by block desc
/

SELECT 'alter system kill session '''||vs.sid||','||vs.serial#||'''' ,al.
object_name, al.object_type, vs.status,
fu.user_name,vs.process,vs.osuser,vs.username,
to_char(vs.logon_time,'DD-MON HH24:MI:SS') logon_time, vs.program
FROM fnd_logins fl, fnd_user fu, all_objects al, v$lock vl, v$session vs
WHERE fl.pid = vl.sid
AND vl.id1 = al.object_id (+)
AND fl.user_id = fu.user_id
AND to_char (start_time, 'DD-MON-RR') = to_char (sysdate, 'DD-MON-RR')
and vs.sid=vl.sid
and vl.sid = &sid

'ALTERSYSTEMKILLSESSION'''||VS.SID||','||VS.SERIAL#||''''


Reference :

Metalink Note ID: 140969.1