John/ list,
optimizer is set to CHOOSE in both the versions,
even if the optimizer is choosing a different path , it's still
parsing each statement in 7.3.2 !! (that should show in latch contention)
> ----------
> From: Jon Walthour[SMTP:[EMAIL PROTECTED]]
> Reply To: [EMAIL PROTECTED]
> Sent: Thursday, July 26, 2001 5:56 PM
> To: Multiple recipients of list ORACLE-L
> Subject: Re: how do i explain this ?
>
> Is it possible that under 7.3.2 the optimizer was rule-based (I don't know
> when CBO was introduced) and that under 8.1.5 it is set to CHOOSE or
> FIRST_ROWS or ALL_ROWS?
>
> Also, is there anyway you could move to 8.1.6 and take advantage of the
> CURSOR_SHARING parameter?
>
> Jon Walthour
> ----- Original Message -----
> To: "Multiple recipients of list ORACLE-L" <[EMAIL PROTECTED]>
> Sent: Thursday, July 26, 2001 5:37 AM
>
>
> > list,
> > this application heavyly make use of literals , NO BIND VARIABLES
> > and was running without any lib cache latch or shared pool latch
> problems
> on
> > 7.3.2
> >
> > We ported the DB to 8.1.5 and v$session_wait is full of "latch free"
> event
> > !!
> > all the latch waits are on lib cache and shapred pool (as expected from
> any
> > app NOT using bind vars)
> > and the app is running terribly slow !!
> >
> > my question is... how 7.3.2 was able to handle this ?? how i explain
> this
> to
> > my management ?
> > i was able to convince then on porting to 8i to get better perfornace !!
> >
> > note: i cannot change the app. all changes must be from the back end.
> >
> > TIA
> >
> > Rahul
> >
> > --
> > Please see the official ORACLE-L FAQ: http://www.orafaq.com
> > --
> > Author: Rahul
> > INET: [EMAIL PROTECTED]
> >
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> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> --
> Author: Jon Walthour
> INET: [EMAIL PROTECTED]
>
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--
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--
Author: Rahul
INET: [EMAIL PROTECTED]
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San Diego, California -- Public Internet access / Mailing Lists
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