Determinig the user of the blocking session.

Question

I have an EBS system where users are creating locks that block others . I know that this is a user issue and they should use the system properly and not make changes and not save or rollback.
However , Every once in a while I get the same issue , A session is making a lock which is holding all the requests . All works fine after I kill the session but I need to identify the user who is doing this so I can talk to him and educate him on how to use the system properly .
The issue is the session “ as expected “ logs into the database using the apps user . How can I identify the user creating this issue ??? .
I am looking for apps username like sysadmin, tareq, mike,...
Thanks,
Tareq

Answer 1

Hi Tareq;
Please try below query which show who makes block
select 'alter system kill session ' || chr(39) || s.sid || ', ' || s.serial# || chr(39) || ';', s.inst_id,
'kill -9 ' || p.spid, s.username, s.module
from gv$session s, gv$process p
where p.inst_id = s.inst_id
and p.addr = s.paddr
and s.type <> 'BACKGROUND'
and s.sid in (
SELECT DECODE(request, 0, sid, -1) sid
FROM gV$LOCK
WHERE (id1, id2, TYPE) IN (SELECT id1, id2, TYPE FROM GV$LOCK WHERE lmode = 0)
Also check this:
select a.SID "Blocking Session", b.SID "Blocked Session"
from v$lock a, v$lock b
where a.SID != b.SID
and a.ID1 = b.ID1
and a.ID2 = b.ID2
and b.request > 0
and a.block = 1;
Regard
Helios