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Cary is certainly welcome to correct me if I'm wrong, but I think, since
it doesn't make logical sense to have negative wait time, you should
report 0 wait time and the negative time as "unaccounted for"....
Mark J. Bobak
Oracle DBA
ProQuest Company
Ann Arbor, MI
"Imagination was given to man to compensate him for what he is not, and
a sense of humor was provided to console him for what he is." --Horace
Walpole
-----Original Message-----
From: Jamadagni, Rajendra [mailto:Rajendra.Jamadagni_at_espn.com]=20
Sent: Monday, February 02, 2004 10:54 AM
To: oracle-l_at_freelists.org
Subject: RE: Negative wait time
Thanks Cary, so is it okay to ignore negative wait times?
Raj
-----Original Message-----
From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org]On Behalf Of Cary Millsap
Sent: Monday, February 02, 2004 10:48 AM
To: oracle-l_at_freelists.org
Subject: RE: Negative wait time
Quantization error.
The error is greater on the 'c' statistic than any other, because it is obtained by polling in 10,000-microsecond increments.
Cary Millsap
Hotsos Enterprises, Ltd.
http://www.hotsos.com
* Nullius in verba *
Upcoming events:
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-----Original Message-----
From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Jamadagni, Rajendra
Sent: Monday, February 02, 2004 8:03 AM
To: Oracle List (E-mail)
Subject: Negative wait time
Okay it is Monday and I seem to have difficulty remembering stuff ...
I wrote a pl/sql procedure that analyzes a given trace file and produces
output like this ... but look at wait time ... why is it < 0 ??=3D20
wait =3D3D elapsed-cpu right? What am I missing? In case you are =
wondering
... this procedure (and its output) is based on Cary's paper 'LIO Vs
PIO' ... not precise, but should be pretty close.
SQL Hash Value : 98525727
SELECT count(distinct(us.Ut_Id)) Res_Prmpt
From yyyy ms, zzzz us
Where ms.Mg_Unit_Id =3D3D us.Ut_Id
And us.Pob_Id =3D3D :b4 and ( :b3 IS NULL OR us.Line_Number =3D3D :b3 ) And us.Monday_Dt between :b2 AND :b1 And us.Makegood =3D3D 'A' And us.Reason_Cd <> -19 And ms.Mg_Unit_Type =3D3D 'P' And us.Ut_Id Not In (Select ms1.Mg_Unit_Id From xxxx ms1, yyyy mh Where ms1.Mg_Number =3D3D mh.Mg_Number And ms1.Mg_Unit_Type =3D3D 'M' And mh.Mg_Pob_Id =3D3D :b4 And mh.Mg_Line_Number =3D3D us.Line_Number) -------- Response Time -------- Action Count Rows Ela Time CPU Time Wait Time LIO Blocks PIOBlocks
Any pointers are welcome, and yes please excuse me while I go have
another coffee.
Raj
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