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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 *
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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 ?? wait = 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 = us.Ut_Id
And us.Pob_Id = :b4 and ( :b3 IS NULL OR us.Line_Number = :b3 ) And us.Monday_Dt between :b2 AND :b1 And us.Makegood = 'A' And us.Reason_Cd <> -19 And ms.Mg_Unit_Type = 'P' And us.Ut_Id Not In (Select ms1.Mg_Unit_Id From xxxx ms1, yyyy mh Where ms1.Mg_Number = mh.Mg_Number And ms1.Mg_Unit_Type = 'M' And mh.Mg_Pob_Id = :b4 And mh.Mg_Line_Number = 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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