RE: oracle can ignore hints

This would be nice if it causes Oracle itself to ignore its own hints
specified in the kernel that take care of execution plans, PQ, etc :)
 
Waleed

-----Original Message----- 
From: K Gopalakrishnan [mailto:kaygopal@xxxxxxxxx] 
Sent: Thu 3/4/2004 11:41 PM 
To: oracle-l@xxxxxxxxxxxxx 
Cc: 
Subject: Re: oracle can ignore hints



Jonathan: 

It is version dependent. I am sure you like that. 
BTW starting from 10g you can ask oracle to ignore the hints by setting an 
underscore parameter. 

Regards, 
Gopal 

----- Original Message ----- 
From: "Jonathan Lewis" <jonathan@xxxxxxxxxxxxxxxxxx> 
To: <oracle-l@xxxxxxxxxxxxx> 
Sent: Friday, March 05, 2004 3:09 AM 
Subject: Re: oracle can ignore hints 


> 
> No. 
> 
> The intent is that they should be absolute directives; 
> but there are conditions that put hints out of context, 
> which means they become irrelevant. 
> 
> If it can happen at all, it can be hinted. 
> 
> Regards 
> 
> Jonathan Lewis 
> http://www.jlcomp.demon.co.uk
<https://access0.fidelity.com/,DanaInfo=www.jlcomp.demon.co.uk+>  
> 
> The Co-operative Oracle Users' FAQ 
> http://www.jlcomp.demon.co.uk/faq/ind_faq.html
<https://access0.fidelity.com/faq/ind_faq.html,DanaInfo=www.jlcomp.demon.co.
uk+>  
> 
> March 2004 Hotsos Symposium - The Burden of Proof 
>   Dynamic Sampling - an investigation 
> March 2004 Charlotte OUG (www.cltoug.org) CBO Tutorial 
> April 2004 Iceland 
> June  2004      UK - Optimising Oracle Seminar 
> 
> 
> ----- Original Message ----- 
> From: "April Wells" <AWells@xxxxxxxxxx> 
> To: <oracle-l@xxxxxxxxxxxxx> 
> Sent: Thursday, March 04, 2004 7:44 PM 
> Subject: RE: oracle can ignore hints 
> 
> 
> : 
> : Yep, they are 'friendly suggestions' that the CBO can simply choose to 
> : ignore if it thinks it knows better than you. 
> : 
> : We have one query that we have hinted, we have computed statistics, we 
> have 
> : built histograms, we have jumped through hoops... the only way to force 
it 
> : to use an index is to Never analyze that index and to hope, then, that 
the 
> : CBO makes the right assumptions. 
> : 
> 
> 
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