RE: how do i explain this ?

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:jonw_at_fuse.net]
> Reply To: ORACLE-L_at_fatcity.com
> 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" <ORACLE-L_at_fatcity.com>
> 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
> >
> > --
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> > --
> > Author: Rahul
> > INET: rahul_at_ratelindo.co.id
> >
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> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> --
> Author: Jon Walthour
> INET: jonw_at_fuse.net
>
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-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: Rahul
  INET: rahul_at_ratelindo.co.id

Fat City Network Services    -- (858) 538-5051  FAX: (858) 538-5051
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