RE: raw traces - EXEC: c=10,000 e=40

<me> reads Jonathan's description and blushes</me>

So it'll be a *feature* and not a bug then. IIRC e comes from POSIX gettimeofday calls on all platforms except Windows -- where it looks like GetTickCount. If this is true then the accuracy of e will be limited by the accuracy of gettimeofday.

Niall

> -----Original Message-----
> From: ml-errors_at_fatcity.com [mailto:ml-errors_at_fatcity.com] On
> Behalf Of Niall Litchfield
> Sent: 02 December 2003 22:24
> To: Multiple recipients of list ORACLE-L
> Subject: RE: raw traces - EXEC: c=10,000 e=40
>
>
> I'd be highly, highly suspicious of the cpu time c.
>
> 1. You should be able to verify (roughly the elapsed time) of
> the statement, if by no other means than running in sqlplus
> with timing on.
> 2. 3 statements with *exactly* the same cpu time - all in
> very very round numbers. Seems unlikely to me.
>
> Might be an hp-ux bug but as I don't have HP-UX to play with
> that is speculation of the first order.
>
> Niall
>
> > -----Original Message-----
> > From: ml-errors_at_fatcity.com [mailto:ml-errors_at_fatcity.com] On
> > Behalf Of Boris Dali
> > Sent: 02 December 2003 20:49
> > To: Multiple recipients of list ORACLE-L
> > Subject: raw traces - EXEC: c=10,000 e=40
> >
> >
> > Reading Cary's book I understand that c and e are
> > measured via different system calls (haven't truss'ed
> > [well tusc'ed] them yet - I am on HP-UX 11.11), but
> > would anybody know what the reasonable upper limit of
> > c-e might be?
> >
> > I am looking at the trace file where c is more than
> > two orders of magnitude greater than e, which make me
> > wonder if I a have some anomaly on my system
> >
> > Some examples:
> >
> > EXEC
> >
> #98:c=10000,e=433,p=0,cr=2,cu=2,mis=0,r=1,dep=1,og=4,tim=1777312113968
> >
> > EXEC
> > #110:c=10000,e=390,p=0,cr=1,cu=3,mis=0,r=1,dep=1,og=4,tim=1777
> > 312181650
> >
> > PARSE
> >
> #103:c=10000,e=40,p=0,cr=0,cu=0,mis=0,r=0,dep=1,og=4,tim=1777314524922
> >
> > Oracle 9.2.0.4.0 on HP-UX 11.11
> >
> > Thanks,
> > Boris Dali.
> >
> > ______________________________________________________________
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> > Author: Boris Dali
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> Author: Niall Litchfield
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-- 
Author: Niall Litchfield
  INET: niall.litchfield_at_dial.pipex.com

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