Mogens
Cary Millsap wrote:
I'm pretty sure that RBO is *gone* in 10g. If I understood correctly what I learned this week, there will be no more RBO, just one optimizer code path called the Oracle Query Optimizer. Also, if I understand correctly, the "RULE" hint will have exactly the same functionality as the "HEY, DUDE" hint: none.
...But I haven't tested it.
Cary Millsap Hotsos Enterprises, Ltd. http://www.hotsos.com
Upcoming events: - Performance Diagnosis 101: 10/28 Phoenix, 11/19 Sydney - Hotsos Symposium 2004: March 7-10 Dallas - Visit www.hotsos.com for schedule details...
-----Original Message----- [EMAIL PROTECTED] Sent: Tuesday, October 07, 2003 1:49 PM To: Multiple recipients of list ORACLE-L
i dont think they are totally removing the RBO from 10g. Ive seen
conflicting reports. I think tom kyte hinted that it is gone, then I
read somewhere else that its still going to be there.
RBO is necessary if you use layered complex views. CBO often times
doesnt hold up. Its a pretty bad design. But some people use it. I see
it mostly with cross-platform apps. They tell you to always use RBO.
if the RBO is totally gone they will need to totally re-architecture
their products. So I dont know if Oracle will do this.
we had toFrom: [EMAIL PROTECTED] Date: 2003/10/07 Tue PM 02:04:31 EDT To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]> Subject: Re: Desupport of RBO
OK, dumb question. Does this mean the rule hint won't be possible? Application I support mostly uses CBO but there have been cases where
resort to RBO hint. 'course it'll be some time before we can considerv10...
Kip
|Hi Jared,
|haven't seen it, too. But the fact |was spreaded over the newsgroups.
|We still have some 3rd party apps that don't use |*any* feature above Oracle 7 (well, almost). Queries with |the RULE hint where it's not necessary. |But if we change a thing, support will be lost. |So we decided to rewrite the whole app. |Lucky me: enough work for the next years.
|Greetings, |Guido
|>>> [EMAIL PROTECTED] 07.10.2003 01.34 Uhr >>> |First time I've seen this note: 189702.1
|Jared
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