Oracle FAQ | Your Portal to the Oracle Knowledge Grid |
Home -> Community -> Mailing Lists -> Oracle-L -> 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:
- Performance Diagnosis 101: 2/24 San Diego, 3/23 Park City, 4/6 Seattle
-----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 ??=20 wait =3D 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 =3D us.Ut_Id
And us.Pob_Id =3D :b4 and ( :b3 IS NULL OR us.Line_Number =3D :b3 ) And us.Monday_Dt between :b2 AND :b1 And us.Makegood =3D 'A' And us.Reason_Cd <> -19 And ms.Mg_Unit_Type =3D 'P' And us.Ut_Id Not In (Select ms1.Mg_Unit_Id From xxxx ms1, yyyy mh Where ms1.Mg_Number =3D mh.Mg_Number And ms1.Mg_Unit_Type =3D 'M' And mh.Mg_Pob_Id =3D :b4 And mh.Mg_Line_Number =3D 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
-- Archives are at http://www.freelists.org/archives/oracle-l/ FAQ is at http://www.freelists.org/help/fom-serve/cache/1.html ----------------------------------------------------------------- ---------------------------------------------------------------- Please see the official ORACLE-L FAQ: http://www.orafaq.com ---------------------------------------------------------------- To unsubscribe send email to: oracle-l-request_at_freelists.org put 'unsubscribe' in the subject line. -- Archives are at http://www.freelists.org/archives/oracle-l/ FAQ is at http://www.freelists.org/help/fom-serve/cache/1.html ----------------------------------------------------------------- ---------------------------------------------------------------- Please see the official ORACLE-L FAQ: http://www.orafaq.com ---------------------------------------------------------------- To unsubscribe send email to: oracle-l-request_at_freelists.org put 'unsubscribe' in the subject line. -- Archives are at http://www.freelists.org/archives/oracle-l/ FAQ is at http://www.freelists.org/help/fom-serve/cache/1.html -----------------------------------------------------------------Received on Mon Feb 02 2004 - 09:53:50 CST