Comments on: Oracle 11g Adaptive Cursor Sharing (ACS) http://kerryosborne.oracle-guy.com/2009/06/oracle-11g-adaptive-cursor-sharing-acs/ Just another Oracle blog Thu, 09 Sep 2010 23:35:14 +0000 http://wordpress.org/?v=2.6.3 By: osborne http://kerryosborne.oracle-guy.com/2009/06/oracle-11g-adaptive-cursor-sharing-acs/#comment-5631 osborne Thu, 12 Nov 2009 19:50:34 +0000 http://kerryosborne.oracle-guy.com/?p=1085#comment-5631 Brian, Yes I have tested it in 11gR2. It appears to have the same 14 bind variable limit. I don't think it's a bug by the way. I think it's just undocumented behavior. Kerry Brian,

Yes I have tested it in 11gR2. It appears to have the same 14 bind variable limit. I don’t think it’s a bug by the way. I think it’s just undocumented behavior.

Kerry

]]> By: Brian Wong http://kerryosborne.oracle-guy.com/2009/06/oracle-11g-adaptive-cursor-sharing-acs/#comment-5628 Brian Wong Thu, 12 Nov 2009 00:42:29 +0000 http://kerryosborne.oracle-guy.com/?p=1085#comment-5628 Hello, Kerry: Very good info here. Have you tried it on 11gRel2? I wonder if it fixes this limitation/bug? Brian Hello, Kerry:

Very good info here. Have you tried it on 11gRel2? I wonder if it fixes this limitation/bug?

Brian

]]> By: osborne http://kerryosborne.oracle-guy.com/2009/06/oracle-11g-adaptive-cursor-sharing-acs/#comment-2547 osborne Tue, 16 Jun 2009 18:44:41 +0000 http://kerryosborne.oracle-guy.com/?p=1085#comment-2547 Timur, I have not contacted support to request an enhancement. I have seen a couple of references to the fact that they are already working on a hint to mark a statement as bind aware. It doesn't seem like a great approach though as a hint would require changes to the code. I agree with you that something like the colored sql approach would be better. And as part of that process, it would need to save the plan details and supporting bind variable histogram data so that it didn't have to re-discover which bind variables should go with which plans. Kerry Timur,

I have not contacted support to request an enhancement. I have seen a couple of references to the fact that they are already working on a hint to mark a statement as bind aware. It doesn’t seem like a great approach though as a hint would require changes to the code. I agree with you that something like the colored sql approach would be better. And as part of that process, it would need to save the plan details and supporting bind variable histogram data so that it didn’t have to re-discover which bind variables should go with which plans.

Kerry

]]> By: Timur Akhmadeev http://kerryosborne.oracle-guy.com/2009/06/oracle-11g-adaptive-cursor-sharing-acs/#comment-2532 Timur Akhmadeev Tue, 16 Jun 2009 07:33:05 +0000 http://kerryosborne.oracle-guy.com/?p=1085#comment-2532 Hello, Kerry. Thanks for good example of real experience with ACS - very informative and to the point. Have you contacted Oracle Support about your wishes to permanently mark a statement as bind-aware? for ex., something similar to <a href="http://download.oracle.com/docs/cd/B28359_01/appdev.111/b28419/d_wkrpos.htm#sthref9967" rel="nofollow">colored sql</a> - it would be great improvement to current features of ACS and, I think, not so difficult to implement. Hello, Kerry.

Thanks for good example of real experience with ACS - very informative and to the point.
Have you contacted Oracle Support about your wishes to permanently mark a statement as bind-aware? for ex., something similar to colored sql - it would be great improvement to current features of ACS and, I think, not so difficult to implement.

]]> By: osborne http://kerryosborne.oracle-guy.com/2009/06/oracle-11g-adaptive-cursor-sharing-acs/#comment-2282 osborne Tue, 02 Jun 2009 12:57:30 +0000 http://kerryosborne.oracle-guy.com/?p=1085#comment-2282 Thanks Ric. I'll be interested to see how it works out for you. Kerry Thanks Ric.

I’ll be interested to see how it works out for you.

Kerry

]]> By: Ric Van Dyke http://kerryosborne.oracle-guy.com/2009/06/oracle-11g-adaptive-cursor-sharing-acs/#comment-2253 Ric Van Dyke Mon, 01 Jun 2009 21:43:08 +0000 http://kerryosborne.oracle-guy.com/?p=1085#comment-2253 Kerry, This is some great stuff. I never did push the number of BINDs to see if there was a limit that way. Very interesting to see that, certainly not something I expected. Yes I fully agree that this isn't quite done in the oven. Needs more time to get the kinks worked out, but like you I see this as a step in the right direction. The site I'm at is about to launch a production system under 11 soon, I hope to observe ACS in that system to see how it fairs here. - Ric Kerry,
This is some great stuff. I never did push the number of BINDs to see if there was a limit that way. Very interesting to see that, certainly not something I expected. Yes I fully agree that this isn’t quite done in the oven. Needs more time to get the kinks worked out, but like you I see this as a step in the right direction. The site I’m at is about to launch a production system under 11 soon, I hope to observe ACS in that system to see how it fairs here.

- Ric

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