Comments on: Plan Stability Through Upgrade-Why is my plan changed?-new optimizer parameters

By: Plan stability through Upgrade to 11G-Why is my plan changed?-Auto Adjusted Dynamic Sampling « Coskan’s Approach to Oracle

Thu, 31 May 2012 19:59:51 +0000

[...] any control via an optimizer parameter. How do I know it ? If you follow what I have done in the optimizer features post you can see there is no controlling on this feature via a parameter. So we only have optimizer [...]

By: Srinivas

Srinivas — Mon, 27 Feb 2012 14:09:13 +0000

Hi,

It’s really nice article and it’s helped me to solve problem fastly in our critical database.

1)recently we upgraded our database to 11.2.0.2 from 10.2.0.4 and queries taking 3hrs where the same query completed in 1min in 10.2.0.4.

2) If we put OFE to 10.2.0.4 queries completing in 1min. By using your scripts,I have found that parameters which are changed and disabled all the parameters in session level except OFE but still query taking more time.

3)Can you kindly help me here to find out and solve the problem permanently

By: Raju.

Raju. — Thu, 08 Dec 2011 19:46:48 +0000

Nice article, noticed one small issue in script build_opt_param_table.sql, it should be &optimizer_feature_version instead of &optimizer_feature.

Thanks.

By: pramod

pramod — Fri, 11 Nov 2011 21:36:23 +0000

Nice

By: Xavier

Xavier — Sat, 02 Apr 2011 10:29:13 +0000

Very useful post!

Currently implementing an Extended RAC in 11gR2 and was trying to figure out what changes had been introduced in the CBO, since the behavior of legacy applications (10g) had changed substantially.

Congratulations on your great work and thanks a lot for sharing it.

By: Plan stability through Upgrade to 11G-Why is my plan changed?-extra nested loop « Coskan’s Approach to Oracle

Fri, 04 Mar 2011 13:30:53 +0000

[...] Plan Stability Through Upgrade-Why is my plan changed?-new optimizer parameters [...]

By: AlexG

AlexG — Tue, 22 Feb 2011 14:05:29 +0000

A great article !

Thanks

By: Plan stability through Upgrade to 11G-Introduction « Coskan’s Approach to Oracle

Thu, 17 Feb 2011 20:59:41 +0000

[...] 3-Why is my plan changed?-bugfixes : how you can find which bug fix may caused your plan change 4-Why is my plan changed?-new optimizer parameters : how you can find which parameter change/addition may caused your plan change 5-Why is my plan [...]

By: Plan Stability Through Upgrade-Why is my plan changed?-bugfixes-2 « Coskan’s Approach to Oracle

Thu, 17 Feb 2011 20:19:14 +0000

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