Try RULE hint. Sometimes, queries against data dictionary perform much
better with RULE hint.
HTH,
Gerardo
-----Original Message-----
Sent: Wednesday, June 26, 2002 8:48 AM
To: Multiple recipients of list ORACLE-L
hi, dbas:
This is the quesiton i met, see if someone can explain it to me,
Sun Solaris 7 with 12CPU/12G mem.
Oracle 8.1.7.2 64bit.
About 350 concurrent connected users.
Simple SQL:
SQL> set linesize 200
SQL> alter session set events '10046 trace name context forever,level 12';
Session altered.
Elapsed: 00:00:00.04
SQL> select username,event,sum(total_waits),sum(total_timeouts
),sum(time_waited),avg(average_wait),max(max_wait)
2 from v$session a,v$session_event b
3 where a.sid=b.sid
4 group by username,event;
It takes this long time:
145 rows selected.
Elapsed: 00:03:30.02
During the time the sql is executing, the process is consuming 100% of a
single cpu.(from top)
And during the time the sql is executing, the wait event is like:(i execute
the sql via perfstat user)
SQL> select sid,event,p1,p2 from v$session_wait where sid in(select sid from
v$session where username='PERFSTAT');
SID EVENT
---------- ----------------------------------------------------------------
P1 P2
---------- ----------
100 SQL*Net message from client
1650815232 1
What is going on on earth?
And through the trace file tkprof from the 9i :
select username,event,sum(total_waits),sum(total_timeouts
),sum(time_waited),avg(average_wait),max(max_wait)
from v$session a,v$session_event b
where a.sid=b.sid
group by username,event
call count cpu elapsed disk query current rows
------- ------ -------- ---------- ---------- ---------- ----------
----------
Parse 1 0.02 0.05 0 0 0 0
Execute 1 0.00 0.00 0 0 0 0
Fetch 11 207.72 209.87 0 0 0 145
------- ------ -------- ---------- ---------- ---------- ----------
----------
total 13 207.74 209.92 0 0 0 145
Misses in library cache during parse: 1
Optimizer goal: FIRST_ROWS
Parsing user id: 62
Rows Row Source Operation
------- ---------------------------------------------------
145 SORT GROUP BY
2903 NESTED LOOPS
2904 NESTED LOOPS
365 FIXED TABLE FULL X$KSUSE
3267 FIXED TABLE FULL X$KSLES
2903 FIXED TABLE FIXED INDEX #2 X$KSLED
Elapsed times include waiting on following events:
Event waited on Times Max. Wait Total Waited
---------------------------------------- Waited ---------- ------------
SQL*Net message to client 11 0.00 0.00
SQL*Net message from client 11 332.38 332.43
Can someone explain it for me?
Good luck
chaos
[EMAIL PROTECTED]
zhu chao
DBA of Eachnet.com
86-021-32174588-667
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