I UPDATE OUTLN.OL$HINTS, doesn't that in fact directly manipulate the table?
Main Topics
Browse All Topics
Loading Advertisement...
Question
Stored outlines in Oracle 11g
When upgrading to 10g last year we had an issue with Siebel efficiency. Since siebel creates its own queries we could not optimize this through our sql code. The solution was to use stored outlines to trick oracle into doing the right thing (in this case query all rows instead of the 10 rows which was siebels default set at the session level). This was achieved by using this code:
ACTION PLAN
============
1. Create a outline for the query without any hint.
SQL> create outline osql on <select statement>
2. Create a outline for the query with hint.
SQL> create outline hsql on <select /*+ ALL_ROWS */ ...........>
3. Run the below update statement to exchange the outline osql and hsql.
SQL> UPDATE OUTLN.OL$HINTS
SET OL_NAME=DECODE(OL_NAME,'HS
WHERE OL_NAME IN ('HSQL','OSQL');
SQL> commit;
My problem is in 11g, the documentation clearly states:
"Oracle creates the USER_OUTLINES and USER_OUTLINE_HINTS views in the SYS tablespace based on data in the OL$ and OL$HINTS tables, respectively. Direct manipulation of the OL$, OL$HINTS, and OL$NODES tables is prohibited. "
http://download.oracle.com
That being the case, how do I now work around this issue? I heard something about using 'base outlines' but haven't found much documentation on that.
This Question has been solved and asker verified All Experts Exchange premium technology solutions are available to subscription members.
Subscribe now for full access to Experts Exchange and get
Instant Access to this Solution
- Plus...
- 30 Day FREE access, no risk, no obligation
- Collaborate with the world's top tech experts
- Unlimited access to our exclusive solution database
- Never be left without tech help again
Trusted by hundreds of thousands everyday for fast, accurate and reliable tech support.
- "The time we save is the biggest benefit of Experts Exchange to Warner Bros. What could take multiple guys 2 hours or more each to find is accessed in around 15 minutes on Experts Exchange." Mike Kapnisakis, Warner Bros.
- "Our team likes having a resource that is more secure than just using Google and most experts using this service really know their stuff. It's nice to look here first versus using Google." Dayna Sellner, Lockheed Martin
- "Anytime that I've been stumped with a problem, 9 out of 10 times Experts Exchange has either the accepted solution or an open discussion of the potential solution to the problem." Kenny Red, eBay Inc.
See what Experts Exchange can do for you.
Got a question?
We've got the answer.
Experts Exchange has been collecting answers to technology questions since 1996…3 million and counting! If you have a question, chances are we already have your answer.
Need individual assistance?
Our experts are ready to help.
If you can't find the exact answer you're looking for, ask our exclusive community of 50,000 experts. You’ll get a personalized answer from a trusted professional.
Want to learn from the best?
Read articles from industry experts.
Thousands of free tech tips, tricks, how-to’s and tutorials are available in our peer reviewed articles section. See for yourself how smart our experts are, no login required.
Working on a long term project?
Store your work and research.
Save solutions to your questions, answers you’ve discovered through searching plus helpful articles in your personal knowledgebase for easy future access.
Access the answers to your technology questions today.
30-day free trial. Register in 60 seconds.
What Makes Experts Exchange Unique?
Members of the expert community talk about why the experience at Experts Exchange is different than what you will find anywhere else.
Trusted by the world's most respected brands.
Faithfully serving IT professionals since 1996.
Try it out and discover for yourself.
30-day free trial. Register in 60 seconds.
Free Tech Articles
-
WARNING: 5 Reasons why you should NEVER fix a computer for free.
It is in our nature to love the puzzle. We are obsessed. The lot of us. We love puzzles. We love the challenge. We thrive on finding the answer. We hate disarray. It bothers us deep in our soul. W...
-
SCCM OSD Basic troubleshooting
SCCM 2007 OSD is a fantastic way to deploy operating systems, however, like most things SCCM issues can sometimes be difficult to resolve due to the sheer volume of logs to sift through and the dispe...
-
Migrate Small Business Server 2003 to Exchange 2010 and Windows 2008 R2
This guide is intended to provide step by step instructions on how to migrate from Small Business Server 2003 to Windows 2008 R2 with Exchange 2010. For this migration to work you will need the fo...
-
Create a Win7 Gadget
This article shows you how to create a simple "Gadget" -- a sort of mini-application supported by Windows 7 and Vista. Gadgets can be dropped anywhere on the desktop to provide instant information, ...
-
Outlook continually prompting for username and password
There have been a lot of questions recently regarding Outlook prompting for a username and password whilst using Exchange 2007. There are a few reasons why this would happen and I will try to cover t...
-
Backup Exchange 2010 Information Store using Windows Backup
There seems to be quite a lot of confusion around the ability to backup Exchange 2010 using the built in Windows Backup feature. This stems from the omission of this feature prior to Exchange 2007 s...
Cloud Class Webinars
- Avoiding Bugs in Microsoft Access
Alison Balter takes and in-depth look at avoiding bugs in Access. In this webinar you will learn about using the immediate window to debug your applications, invoking the debugger, using breakpoints to troubleshoot, stepping through code, setting the next statement to execute, ...
- Top 10 Best New Features in Visio 2010
Scott Helmers gives live demonstrations of the top 10 new features in Visio 2010. This webinar will teach you how to create compelling diagrams by adding shapes to the page with a single click, linking the shapes in a diagram to data in Excel (or SQL Server, or SharePoint), ...
- IT Consultant Business Secrets Revealed
Michael Munger, Experts Exchange tech pro and IT consultant, pulls back the curtain on his very successful businesses and answers question on every IT consultant and business owner should know about. He shares secrets on what he did to solve the 5 most common problems in IT, ...
- Disaster Recovery and Business Continuity
Quest CTO, Mike Billon, gives an overview of the steps involved in building a dunamic disaster recovery plan. Through case studies and an examination of software/hardware tooles for monitoring and testing, you'll gain a better understandin of where you are, where you want ...
- Organize Your Visio Diagrams with Containers and Lists
Scott Helmers uses cross functional flowcharts, wireframe diagrams, data graphic legends and seating charts to teach you: how to ustilize all three new structured diagram components in Visio 2010, the best practices for organizeing shapes in previous version of Visio, how to organize ...
- How to Us Objects, Properties, Events and Methods in Microsoft Access
Alison Dalter gives an in-depbth look at objects, properties, events and methods in Microsoft Access. In this webinar you will learn about using the object browser, referring to objects, working with properties and methods, working with object variables, understanding the ...
Join the Community
Give a Little. Get a Lot.
Join the community of experts here and help other tech pros by answering question in your area of expertise. You can earn FREE access to all Experts Exchange's premium features and resources.
Answers
Did some research and though Oracle says it is prohibited, it seems to hint that 11gR1 still works the way it used to, but the docs recommend to use SQL Plan Baseline feature because the stored outlines will be deprecated / desupported.
I'm here: http://download.oracle.com
No definitive answer, as this is not a feature I've used lately, but will try to figure it out if I can get the time to play.
I would not act at the dbms level for this purpose.
It adds a maintenance task that is pricey.
If your stats are to date, you may have a problem of mismatching usage of a column.
Ex: Using the same ext_XM.ATTRIB1 column to store TYPE = "ID" and TYPE = "LOV1" will get stats that work with IDs but won't work to search for a LOV1 value
BigSchmuch,
I do agree that the maintenance task is pricey and am certainly not a fan!
My issue has to do with a siebel session call at logon "ALTER SESSION SET optimizer_mode = FIRST_ROWS_10 ", This is a setting through the Siebel app and I am unable to change this. The particular query I run does not have 10 results (it in fact has 7) which apparently causes the query to run twice as long. When I do the outline switch-a-roo using a hint for all rows (recommended by Oracle Support) it is substantially faster.
At this point I am not sure if the optimizer will continue to have issues with this parameter in 11g. It is possible that it is now smart enough to deal with it efficiently. However I am still a few days away from having my hardware available to test.
If you have such a difference in execution time, this means you have a different QueryPlan coming out the query whether you add or miss the hint.
You may look at the difference and understand what statistics is missing its goal
I would try 2 other solutions:
a) a BusComp UserProp
May be an unofficial BC userprop can handle this hint ?
Search for it in Flat mode using patterns like *first* or *FIRST*
b) a statistics modification
Not sure you can handle this in 11g but modifying stats is still another maintenance task...may be easier to handle
3 Ways to Join
Business Accounts
- Perfect for organizations
- Multiple users
- Save over 36%
- Create a Business Account
Answer for Membership
- Earn free access
- Showcase your knowledge
- No credit card required
- Sign Up to Answer
Loading Advertisement...
by: mrjoltcolaPosted on 2009-08-05 at 09:56:46ID: 25025479
I do not think you even need to worry about that. You are not directly manipulating OL$ or the other tables.
If you have CREATE ANY OUTLINE privilege, that should be all you need to accomplish what you've done in prior releases of Oracle.
The OL$ and OL$HINTS tables as the base for the USER_* views is no different than any other USER_* view, they are ALL stored in SYS, and you still can access them quite nicely.
Good luck.