Well my answer to "What most likely is the problem" is "Code".
Bad code generates poor locking. Alot of locking problems are code
problems.
But, look in v$lock (need to run catblock.sql if you haven't already) and
look at the lock types, and objects being locked.
Narrow it down to specific objects. Then talk to development if available
on those areas.
Are you getting deadlocks or just locks?
Another problem is the time from transaction to commit/rollback is too long.
Are ad-hoc dml being run then people going to lunch? Are there procedures
that lock entire tables for lengthy times?
But my first thing I would do is look at v$locks and also try this:
SELECT substr(s1.username,1,12)
"WAITING User"
, substr(s1.osuser,1,8)
"OS User"
, substr(to_char(w.session_id),1,5)
"Sid"
, P1.spid
"PID"
, substr(s2.username,1,12)
"HOLDING User"
, substr(s2.osuser,1,8)
"OS User"
, substr(to_char(h.session_id),1,5)
"Sid"
, P2.spid
"PID"
FROM sys.v_$process P1, sys.v_$process P2,
sys.v_$session S1, sys.v_$session S2,
dba_locks w, dba_locks h
WHERE h.mode_held != 'None'
AND h.mode_held != 'Null'
AND w.mode_requested != 'None'
AND w.lock_type (+) = h.lock_type
AND w.lock_id1 (+) = h.lock_id1
AND w.lock_id2 (+) = h.lock_id2
AND w.session_id =
S1.sid (+)
AND h.session_id =
S2.sid (+)
AND S1.paddr
= P1.addr (+)
AND S2.paddr
= P2.addr (+)
/
"Walking on water and developing software from a specification are easy if
both are frozen."
Christopher R. Spence
Oracle DBA
Fuelspot
-----Original Message-----
Sent: Wednesday, June 06, 2001 2:58 PM
To: Multiple recipients of list ORACLE-L
Hi List,
We have an application running on Oracle database
8.0.5 on NT, this application developed for 1500 users
but after 15 connections every thing is locked, they
asked me to have a look and find out what's the
problem.
If any body have any clue which part must check first
and most likley what sort of problem it is, i really
appreciate.
Thanks in advance.
=====
Hamid Alavi
4268 Flintlock LN
Westlake Village 91631
PH: 818-8790966
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Author: hamid alavi
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