Locks number

Question

Hi,
on 10g R2, on AIX, the response time is very bad.
I have this :
SQL> select count(*) from v$lock;
  COUNT(*)
       225Is it realy a problem ?
Any idea to investigate ?
In alertlog no error message.
I ran AWR and I have this
Top 5 Timed Events                                         Avg %Total
~~~~~~~~~~~~~~~~~~                                        wait   Call
Event                                 Waits    Time (s)   (ms)   Time Wait Class
CPU time                                          6,294          48.0
enq: TX - row lock contention         1,085       3,057   2818   23.3 Applicatio
db file sequential read             383,603         149      0    1.1   User I/O
log file sync                        22,960          53      2    0.4     Commit
log file parallel write              30,803          46      2    0.4 System I/Ohow to go forward ?
Thank you.

Answer 1

You can use the below query (Little customized original author by googling ) to identify history of locks
set lines 300
set pages 100
column event format a30
column sqlt format a50
alter session set nls_date_format = 'DD-MON-YYYY HH24:MI:SS';
select a1.session_id,a1.sr#,a1.sql_id,a1.sqlt,a1.blk,a1.seq#,a1.event,min(a1.samplt),count(*) "Wait in Sec"
from
(select a.session_id, a.session_serial# sr#,a.blocking_session blk,
a.SQL_ID,
substr(b.sql_text,1,50) sqlt,
a.event,cast(a.sample_time as date) samplt ,a.session_state,a.wait_time,a.time_waited,a.p1,a. p2,a.p3,a.seq#
from
dba_hist_active_sess_history a,
v$sqlarea b
where 1=1
and a.sql_id = b.sql_id(+)
and cast(sample_time as date) between '11-SEP-2012 03:35:00' and '11-SEP-2012 03:58:00'
) a1
where a1.event like '%enq%'
group by a1.session_id,a1.sr#,a1.sql_id,a1.sqlt,a1.blk,a1.seq#,a1.event
order by 9 desc
Edited by: vreddy on Sep 12, 2012 8:23 AM
Edited by: vreddy on Sep 12, 2012 8:26 AM