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https://community.oracle.com/thread/400726
Jun 29, 2006 · Hi, the RBO is still there, even in 10g, but it has been despupported. The hints are still there and it also possible to set the OPTIMIZER_MODE to RULE, but: no support for this. Oracle uses the /*+ RULE */ hint internally still in 10g.
http://www.dba-oracle.com/t_gogala_cbo_oltp1.htm
With Oracle 10g, RBO is still here, but is no longer documented or supported. This article is an attempt to give philosophical support to Jonathan Lewis book which provides the gory details of the cost based optimizer. Why was RBO so much loved and why is it so hard to part from it?
http://www.dba-oracle.com/oracle_tips_10g_cbo.htm
Support for the RBO will be removed in Oracle10g. The last release that supports the rule-based optimizer will be Oracle9i Release 2. Why is the RBO being Desupported? The existence of the RBO prevents Oracle from making key enhancements to its query-processing engine. The removal of the RBO will permit Oracle to improve performance and ...
https://community.oracle.com/thread/2336186
Jan 17, 2012 · The RBO is not being developed anymore (since Oracle7), so it works in 11g exactly the same as in 10g, 9i, 8i and 8. By the way, for that reason it does not support any structures introduced in 8 and up (like partitions, function based indexes, etc.). If you have these structures, Oracle will always use the CBO and not RBO.
https://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:4460679969175
Jun 30, 2002 · 1.I am in 8.1.7. If I move the application from RBO to CBO except for the optimizer parameter tuning, can I be assured that all queries will atleast behave with the same performance as that of RBO? 2. In one of my attempts, some queries made the system to hang when moving from RBO to CBO. Pl note all tables, indexes analyzed.
https://www.oracle.com/support/contact.html
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https://asktom.oracle.com/pls/apex/f?p=100:11:0::::P11_QUESTION_ID:1101331800346787951
Aug 20, 2008 · Pored over the output and sure enough, the "bad" plan_hash_value was using the FTS and the Note in the output said "rule based optimizer used (consider using cbo)". I couldn't believe my eyes. Why in the world did that one child cursor use the RBO? Any ideas?
https://searchoracle.techtarget.com/answer/Difference-between-RBO-and-CBO
Could you explain the difference between RBO and CBO? I do not have a clear idea about SQL tuning (Rule Based vs. Cost Based Optimizer). Could you explain the difference between RBO and CBO? ... Whenever Oracle receives a SQL statement, it must decide the best manner in which to retrieve the data from the database. ... With the end of SAP ECC ...Author: Brian Peasland
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