Re: Cost of joins

No such thing. What you are seeking is hard-and-fast "rules" (a la the rule-based optimizer), which is going obsolete and for good reason...

Rather, it would be better to understand the situations in which each type of join works well and the situations in which each type of join works poorly. There is lots of good documentation on this in the "Oracle Server Tuning" references online at http://otn.oracle.com...

• Original Message ----- To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com> Sent: Monday, October 07, 2002 10:04 AM

> Hi there
>
> Can someone please give me in order of preference/cost the relevant costs
> for the different joins.
>
> IE:
>
> This join is cheap,
> This is very expensive,
> This is bad and always avoid.
>
>
> George
> ________________________________________________
> George Leonard
> Oracle Database Administrator
> Dimension Data (Pty) Ltd
> (Reg. No. 1987/006597/07)
> Tel: (+27 11) 575 0573
> Fax: (+27 11) 576 0573
> E-mail:george.leonard_at_za.didata.com
> Web: http://www.didata.co.za
>
> You Have The Obligation to Inform One Honestly of the risk, And As a
Person
> You Are Committed to Educate Yourself to the Total Risk In Any Activity!
> Once Informed & Totally Aware of the Risk, Every Fool Has the Right to
Kill
> or Injure Themselves as They See Fit!
>
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> --
> Author: Leonard, George
> INET: george.leonard_at_farnell.com
>
> Fat City Network Services -- 858-538-5051 http://www.fatcity.com
> San Diego, California -- Mailing list and web hosting services
> ---------------------------------------------------------------------
> To REMOVE yourself from this mailing list, send an E-Mail message
> to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
> the message BODY, include a line containing: UNSUB ORACLE-L
> (or the name of mailing list you want to be removed from). You may
> also send the HELP command for other information (like subscribing).

-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: Tim Gorman
  INET: Tim_at_SageLogix.com

Fat City Network Services    -- 858-538-5051 http://www.fatcity.com
San Diego, California        -- Mailing list and web hosting services
---------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
the message BODY, include a line containing: UNSUB ORACLE-L
(or the name of mailing list you want to be removed from).  You may
also send the HELP command for other information (like subscribing).