Re: Rule Based Optimizer

From: Mogens Nørgaard <mln_at_miracleas.dk>
Date: Tue, 10 Jun 2003 20:56:32 -0700
Message-ID: <F001.005AED15.20030610203920@fatcity.com>

Yep. Here's the official statement from Oracle about RBO in 10i:

“The RBO is Oracle's legacy optimizer originating from Oracle Version 6 and earlier. The RBO is being desupported in Oracle10i. The RBO will still exist in Oracle10i, but will be an unsupported feature and will be removed in a future release. No code changes will be made to the RBO code and no bug fixes will be provided. The RBO was superseded in Oracle7 by the CBO and has continued to be available for backwards compatibility. Oracle Oracle10i will support only one optimizer, and all applications running on that release should use that optimizer. “

What's behind this wording? I don't really know, but I can guess. There's a myth that the RBO hasn't been enhanced since the introduction of CBO in 7.0. That, I learned one day in Steve Adams' car, is not true. It has been enhanced to know about new segment types, etc. A fun (well, fun...) exception to this is partitions. If you're using partitions you're using CBO.

So I read it as: "Yeah, we haven't really enhanced the RBO since 7.0 except to allow it to recognize IOT's and other new segment types. In 10i we won't even do that."

Mogens

Freeman Robert - IL wrote:
<blockquote type="cite"
cite="">
RWB, I'll tell you, if KG says it about Oracle, I pretty much would go to the bank with it.

-----Original Message-----

To: Multiple recipients of list ORACLE-L Sent: 6/10/2003 4:24 PM

Mr. Gopalakrishnan:

How do you know this? Can anyone confirm (or deny) this? I hope it is true!
Oracle should just quit cold turkey and not support the RULE optimizer at
all in any future releases.

RWB

Reginald W. Bailey
IBM Global Services - ETS SW GDSD - Database Management Your Friendly Neighborhood DBA
713-216-7703 (Office) 281-798-5474 (Mobile) 713-415-5410 (Pager)

                    [EMAIL PROTECTED]

                    .com                 To:     [EMAIL PROTECTED]

                    Sent by:             cc:

                    [EMAIL PROTECTED]       Subject:     RE: Rule Based
Optimizer                                               
                    ity.com

 

 

                    06/10/2003

                    12:59 PM

                    Please respond

                    to ORACLE-L

RULE optimizer will not be supported in next version. But you can still use the RULE optimizer and it is just a matter of official support from Oracle.

Best Regards,
K Gopalakrishnan

-----Original Message-----

Goulet, Dick
Sent: Tuesday, June 10, 2003 10:16 AM
To: Multiple recipients of list ORACLE-L

There appears to be a number of folks on the list who have some insight into
the next version of the database. I'd like to ask those folks a simple question. What is the future of the Rule Based Optimizer looking like? Does it die in 10i??

Dick Goulet
Senior Oracle DBA
Oracle Certified 8i DBA
--

Please see the official ORACLE-L FAQ: http://www.orafaq.net
--

Author: Goulet, Dick
INET: [EMAIL PROTECTED]

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: [EMAIL PROTECTED] (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.net
--

Author: K Gopalakrishnan
INET: [EMAIL PROTECTED]

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