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RE: Negative wait time

From: Jamadagni, Rajendra <Rajendra.Jamadagni_at_espn.com>
Date: Mon, 2 Feb 2004 10:53:50 -0500
Message-ID: <A186CBDC8B1D61438BC50F1A77E91F73057C18A4@xchgbrsm1.corp.espn.pvt>


Thanks Cary, so is it okay to ignore negative wait times?

Raj

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Rajendra dot Jamadagni at nospamespn dot com All Views expressed in this email are strictly personal. QOTD: Any clod can have facts, having an opinion is an art !

-----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 PIO
Blocks
------ ------ --------- ---------- ---------- ---------- ----------

PARSE 1 0 0.000 0.000 0.000 0 0
EXEC 51 0 0.004 0.010 -0.006 0 0
FETCH 51 51 0.450 0.390 0.060 9047 11
------ ------ --------- ---------- ---------- ---------- ----------

TOTAL 103 51 0.454 0.400 0.054 9047 11

Any pointers are welcome, and yes please excuse me while I go have another coffee.
Raj




Rajendra dot Jamadagni at nospamespn dot com All Views expressed in this email are strictly personal. QOTD: Any clod can have facts, having an opinion is an art !

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Received on Mon Feb 02 2004 - 09:53:50 CST

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