Comments on: Rule based in Oracle 10g https://technology.amis.nl/2006/10/12/rule-based-in-oracle-10g/ Friends of Oracle and Java Thu, 21 May 2015 20:49:51 +0000 hourly 1 http://wordpress.org/?v=4.2.2 By: CSS Compliant https://technology.amis.nl/2006/10/12/rule-based-in-oracle-10g/#comment-3889 Thu, 12 Oct 2006 14:54:08 +0000 http://technology.amis.nl/blog/?p=1354#comment-3889 Hi,

Could you please suppress the JS popups that complaints that I have a browser

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By: Marco Gralike https://technology.amis.nl/2006/10/12/rule-based-in-oracle-10g/#comment-3888 Thu, 12 Oct 2006 10:14:58 +0000 http://technology.amis.nl/blog/?p=1354#comment-3888 By the way, for those who don’t know, “Dizwells” (aka Howard J Rogers) can be found here: http://www.dizwell.com

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By: Marco Gralike https://technology.amis.nl/2006/10/12/rule-based-in-oracle-10g/#comment-3887 Thu, 12 Oct 2006 10:12:37 +0000 http://technology.amis.nl/blog/?p=1354#comment-3887 Thanks Howard for clarifying this, I wasn’t aware of it.

Only excuse I have is that when I’m sometimes allowed to go to a course (and/or have time), I choose for seminars like those from Tom Kyte, Steve Adam or Chris Date or attend an Oracle Open World (but not Oracle courses). I try to keep up, if I have the time, is to selectively read items in the manuals (like the Concepts Guide) or read up on blog items like those on yours.

😉

To be honest, I would have preferred that they disabled it old together and only for (practical) emergencies had implemented a hidden parameter, in case it is needed by not core Oracle processes. The optimizer is smart enough nowadays to handle almost all situations.

Marco

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By: Howard J. Rogers https://technology.amis.nl/2006/10/12/rule-based-in-oracle-10g/#comment-3886 Wed, 11 Oct 2006 23:52:08 +0000 http://technology.amis.nl/blog/?p=1354#comment-3886 But this is well-documented (in Oracle University’s own 10g New Features training course material, at least!): the Rule-based Optimiser exists and can be used but, as they put it, ‘has undergone almost no regression testing’… which, being translated into English, means that they don’t know if it works properly with all the new 10g code or not. (My best guess is “not”!)

The idea that the RBO ‘disappeared’ or was ‘removed’ was an old myth floating around during the 10g beta days. It wasn’t true then, and it’s not true now. The code is still there, and it’s pretty much exactly the same code as was in 9i… but we simply don’t know if it works properly any more given everything else that went on in 10g.

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