RE: 10046 event is useless in 9.2.0.4 version for response time measuring !!!

  • From: "Cary Millsap" <cary.millsap@xxxxxxxxxx>
  • To: <oracle-l@xxxxxxxxxxxxx>
  • Date: Mon, 2 Aug 2004 11:09:21 -0500

Jurijs,

Even if something takes 6x longer to run the one time you trace it, it's
still better to have the detailed 10046 data than risk being tricked by =
the
aggregation problems introduced by using V$ data.

The problem with 9.2.0.4 is measured in hours at worst. The problem with
being tricked by V$ data is often measurable in months.

I'm not sure whether there's a 9.2.0.4 back-port available. It's a good
question to ask Oracle.
=20

Cary Millsap
Hotsos Enterprises, Ltd.
http://www.hotsos.com
* Nullius in verba *

Upcoming events:
- Performance Diagnosis 101: 8/10 Boston, 9/14 San Francisco, 10/5 =
Charlotte
- SQL Optimization 101: 7/26 Washington DC, 8/16 Minneapolis, 9/20 =
Hartford
- Hotsos Symposium 2005: March 6-10 Dallas
- Visit www.hotsos.com for schedule details...


-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx =
[mailto:oracle-l-bounce@xxxxxxxxxxxxx]
On Behalf Of J.Velikanovs@xxxxxxxx
Sent: Monday, August 02, 2004 10:46 AM
To: oracle-l@xxxxxxxxxxxxx
Cc: oracle-l@xxxxxxxxxxxxx; oracle-l-bounce@xxxxxxxxxxxxx
Subject: RE: 10046 event is useless in 9.2.0.4 version for response time
measuring !!!

Cary,
Thanks for your replay,
But that the .=20
How to discover performance problems on 9.2.0.4, then?
It is seem that 9.2.0.5 not the option ;(
.
Is to ask backport is a good idea in this case, I wonder.
Does some body in the list have tried it?
.
Cary, that is your experience? How to get around it?
.
PS Forgot to mention, test has been executed on the one machine. Two=20
separate OH. RH AS 3.0.

Regards,
Jurijs
9268222
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
http://otn.oracle.com/ocm/jvelikanovs.html






"Cary Millsap" <cary.millsap@xxxxxxxxxx>
Sent by: oracle-l-bounce@xxxxxxxxxxxxx
02.08.2004 18:07
Please respond to oracle-l
=20
        To:     <oracle-l@xxxxxxxxxxxxx>
        cc:=20
        Subject:        RE: 10046 event is useless in 9.2.0.4 version =
for=20
response time measuring !!!


Jurijs,

You've identified the bug correctly. The response time impact will vary =
=3D
from
virtually zero to the 6X number you've discovered, or even worse. (The
problem is the worst for sessions that nest NESTED LOOPS row source
operations inside each other.)

It's a bug. Fix it. The problem is fixed in 9.2.0.5.


Cary Millsap
Hotsos Enterprises, Ltd.
http://www.hotsos.com
* Nullius in verba *

Upcoming events:
- Performance Diagnosis 101: 8/10 Boston, 9/14 San Francisco, 10/5 =3D
Charlotte
- SQL Optimization 101: 7/26 Washington DC, 8/16 Minneapolis, 9/20 =3D
Hartford
- Hotsos Symposium 2005: March 6-10 Dallas
- Visit www.hotsos.com for schedule details...


-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx =3D
[mailto:oracle-l-bounce@xxxxxxxxxxxxx]
On Behalf Of J.Velikanovs@xxxxxxxx
Sent: Monday, August 02, 2004 8:19 AM
To: 'oracle-l@xxxxxxxxxxxxx '
Subject: 10046 event is useless in 9.2.0.4 version for response time
measuring !!!

My regards to all,
At the moment I have impression that, 10046 event is useless in =
9.2.0.4=3D20
version for response time measuring!
I have tied to run loop.sql (see below for full text) with and =
without=3D20
10046 event on 9.2.0.4 & 9.2.0.5.
The results scared me.
Take a look:
.
9.2.0.4=3D20
without 6,45 sec=3D20
!!!!!!!!!!! with 37,36 sec=3D20
.
9.2.0.5
without 5,48 sec=3D20
!!!!!!!!!!! with 7,19 sec
.
After short investigation it is appears that it is BUG 3009359.
http://metalink.oracle.com/metalink/plsql/showdoc?db=3D3DNOT&id=3D3D30093=
59.8=3D

No one-off fix on 9.2.0.4.
.
So it's appears, that 10046 is useless on 9.2.0.4, because SQL =
Trace=3D20
itself takes 580% of response time.
.
Any comments?!
Have any body solution for this issue.
.
As appears from dictation from this list, to go to 9.2.0.5 is not =
good=3D20
idea, because of instability and other issues.

Thanks in advance,
Jurijs


******************************************
-- loop.sql
declare
vn number;
begin
for f in 1..1000 loop
select count(v) into vn from testlio where n between 10000 and 20000;
end loop;
end;
/
******************************************


TKPROF output
******************************************
9204
******************************************
SELECT count(v)
from
 testlio where n between 10000 and 20000


call     count       cpu    elapsed       disk      query    current  =
=3D
rows
------- ------  -------- ---------- ---------- ---------- =
----------=3D20
----------
Parse        1      0.00       0.00          0          0          0     =
=3D
0
Execute   1000      0.08       0.08          0          0          0     =
=3D
0
Fetch     1000     37.07      36.19          0     132000          0  =
=3D
1000
------- ------  -------- ---------- ---------- ---------- =
----------=3D20
----------
total     2001     37.15      36.27          0     132000          0  =
=3D
1000

Misses in library cache during parse: 1
Optimizer goal: CHOOSE
Parsing user id: SYS   (recursive depth: 1)

Rows     Row Source Operation
-------  ---------------------------------------------------
   1000  SORT AGGREGATE (cr=3D3D132000 r=3D3D0 w=3D3D0 time=3D3D36185613 =
us)
10001000   TABLE ACCESS BY INDEX ROWID TESTLIO (cr=3D3D132000 r=3D3D0 =
w=3D3D0=3D20
time=3D3D28015044 us)
10001000    INDEX RANGE SCAN TESTLIO_I1 (cr=3D3D25000 r=3D3D0 w=3D3D0 =
=3D
time=3D3D9976625=3D20
us)(object id 6318)

******************************************
9205
******************************************
SELECT COUNT(V)
FROM
 TESTLIO WHERE N BETWEEN 10000 AND 20000


call     count       cpu    elapsed       disk      query    current  =
=3D
rows
------- ------  -------- ---------- ---------- ---------- =
----------=3D20
----------
Parse        1      0.00       0.00          0          0          0     =
=3D
0
Execute   1000      0.05       0.07          0          0          0     =
=3D
0
Fetch     1000      6.89       6.72          0     132000          0  =
=3D
1000
------- ------  -------- ---------- ---------- ---------- =
----------=3D20
----------
total     2001      6.94       6.81          0     132000          0  =
=3D
1000

Misses in library cache during parse: 1
Optimizer goal: CHOOSE
Parsing user id: SYS   (recursive depth: 1)

Rows     Row Source Operation
-------  ---------------------------------------------------
   1000  SORT AGGREGATE
10001000   TABLE ACCESS BY INDEX ROWID TESTLIO
10001000    INDEX RANGE SCAN TESTLIO_I1 (object id 6289)

******************************************

RAW portion of TRC file
******************************************
9204
******************************************
PARSING IN CURSOR #5 len=3D3D60 dep=3D3D1 uid=3D3D0 oct=3D3D3 lid=3D3D0 =
=3D
tim=3D3D1065854307286108=3D20
hv=3D3D518780277 ad=3D3D'5aca2538'
SELECT count(v) from testlio where n between 10000 and 20000
END OF STMT
PARSE =3D
#5:c=3D3D0,e=3D3D485,p=3D3D0,cr=3D3D0,cu=3D3D0,mis=3D3D1,r=3D3D0,dep=3D3D=
1,og=3D3D4,tim=3D3D1=3D
065854307286097
BINDS #5:
EXEC =3D
#5:c=3D3D0,e=3D3D134,p=3D3D0,cr=3D3D0,cu=3D3D0,mis=3D3D0,r=3D3D0,dep=3D3D=
1,og=3D3D4,tim=3D3D1=3D
065854307286405
FETCH=3D20
#5:c=3D3D40000,e=3D3D36240,p=3D3D0,cr=3D3D132,cu=3D3D0,mis=3D3D0,r=3D3D1,=
dep=3D3D1,og=3D3D4=3D
,tim=3D3D1065854307322684
BINDS #5:
EXEC =3D
#5:c=3D3D0,e=3D3D85,p=3D3D0,cr=3D3D0,cu=3D3D0,mis=3D3D0,r=3D3D0,dep=3D3D1=
,og=3D3D4,tim=3D3D10=3D
65854307322899
FETCH=3D20
#5:c=3D3D40000,e=3D3D36128,p=3D3D0,cr=3D3D132,cu=3D3D0,mis=3D3D0,r=3D3D1,=
dep=3D3D1,og=3D3D4=3D
,tim=3D3D1065854307359065
BINDS #5:
EXEC =3D
#5:c=3D3D0,e=3D3D81,p=3D3D0,cr=3D3D0,cu=3D3D0,mis=3D3D0,r=3D3D0,dep=3D3D1=
,og=3D3D4,tim=3D3D10=3D
65854307359268
FETCH=3D20
#5:c=3D3D30000,e=3D3D36181,p=3D3D0,cr=3D3D132,cu=3D3D0,mis=3D3D0,r=3D3D1,=
dep=3D3D1,og=3D3D4=3D
,tim=3D3D1065854307395487
BINDS #5:
EXEC =3D
#5:c=3D3D0,e=3D3D81,p=3D3D0,cr=3D3D0,cu=3D3D0,mis=3D3D0,r=3D3D0,dep=3D3D1=
,og=3D3D4,tim=3D3D10=3D
65854307395689
FETCH=3D20
#5:c=3D3D40000,e=3D3D36145,p=3D3D0,cr=3D3D132,cu=3D3D0,mis=3D3D0,r=3D3D1,=
dep=3D3D1,og=3D3D4=3D
,tim=3D3D1065854307431871
BINDS #5:
******************************************
9204
******************************************
PARSING IN CURSOR #5 len=3D3D60 dep=3D3D1 uid=3D3D0 oct=3D3D3 lid=3D3D0 =
=3D
tim=3D3D1065854501680779=3D20
hv=3D3D4259315813 ad=3D3D'5bc9bfdc'
SELECT COUNT(V) FROM TESTLIO WHERE N BETWEEN 10000 AND 20000
END OF STMT
PARSE=3D20
#5:c=3D3D0,e=3D3D7476,p=3D3D0,cr=3D3D0,cu=3D3D0,mis=3D3D1,r=3D3D0,dep=3D3=
D1,og=3D3D4,tim=3D3D=3D
1065854501680769
BINDS #5:
EXEC =3D
#5:c=3D3D0,e=3D3D134,p=3D3D0,cr=3D3D0,cu=3D3D0,mis=3D3D0,r=3D3D0,dep=3D3D=
1,og=3D3D4,tim=3D3D1=3D
065854501681077
FETCH=3D20
#5:c=3D3D10000,e=3D3D6736,p=3D3D0,cr=3D3D132,cu=3D3D0,mis=3D3D0,r=3D3D1,d=
ep=3D3D1,og=3D3D4,=3D
tim=3D3D1065854501687852
BINDS #5:
EXEC =3D
#5:c=3D3D0,e=3D3D82,p=3D3D0,cr=3D3D0,cu=3D3D0,mis=3D3D0,r=3D3D0,dep=3D3D1=
,og=3D3D4,tim=3D3D10=3D
65854501688065
FETCH=3D20
#5:c=3D3D0,e=3D3D6707,p=3D3D0,cr=3D3D132,cu=3D3D0,mis=3D3D0,r=3D3D1,dep=3D=
3D1,og=3D3D4,tim=3D3D=3D
1065854501694810
BINDS #5:
EXEC =3D
#5:c=3D3D0,e=3D3D81,p=3D3D0,cr=3D3D0,cu=3D3D0,mis=3D3D0,r=3D3D0,dep=3D3D1=
,og=3D3D4,tim=3D3D10=3D
65854501695011
FETCH=3D20
#5:c=3D3D10000,e=3D3D6699,p=3D3D0,cr=3D3D132,cu=3D3D0,mis=3D3D0,r=3D3D1,d=
ep=3D3D1,og=3D3D4,=3D
tim=3D3D1065854501701747
BINDS #5:
EXEC =3D
#5:c=3D3D0,e=3D3D79,p=3D3D0,cr=3D3D0,cu=3D3D0,mis=3D3D0,r=3D3D0,dep=3D3D1=
,og=3D3D4,tim=3D3D10=3D
65854501701944
FETCH=3D20
#5:c=3D3D10000,e=3D3D6747,p=3D3D0,cr=3D3D132,cu=3D3D0,mis=3D3D0,r=3D3D1,d=
ep=3D3D1,og=3D3D4,=3D
tim=3D3D1065854501708729
BINDS #5:
EXEC =3D
#5:c=3D3D0,e=3D3D80,p=3D3D0,cr=3D3D0,cu=3D3D0,mis=3D3D0,r=3D3D0,dep=3D3D1=
,og=3D3D4,tim=3D3D10=3D
65854501708927
FETCH=3D20
#5:c=3D3D10000,e=3D3D6650,p=3D3D0,cr=3D3D132,cu=3D3D0,mis=3D3D0,r=3D3D1,d=
ep=3D3D1,og=3D3D4,=3D
tim=3D3D1065854501715614
BINDS #5:




=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D=
3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D
=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D=
3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D
=3D3D=3D3D=3D3D
-- mk loop
drop table testlio ;
create table testlio (n number, v varchar2(1000)) tablespace users;
begin for f in 1..30000 loop
insert into testlio values=3D20
(f,'aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa');=
=3D

end loop;
end;
/
create index testlio_i1 on testlio (n) tablespace users;



Jurijs
9268222
=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D=
3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D
=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D=
3D=3D3D=3D3D=3D3D=3D3D
http://otn.oracle.com/ocm/jvelikanovs.html


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