Call now: 252-767-6166  
Oracle Training Oracle Support Development Oracle Apps

 
 Home
 E-mail Us
 Oracle Articles
New Oracle Articles


 Oracle Training
 Oracle Tips

 Oracle Forum
 Class Catalog


 Remote DBA
 Oracle Tuning
 Emergency 911
 RAC Support
 Apps Support
 Analysis
 Design
 Implementation
 Oracle Support


 SQL Tuning
 Security

 Oracle UNIX
 Oracle Linux
 Monitoring
 Remote s
upport
 Remote plans
 Remote
services
 Application Server

 Applications
 Oracle Forms
 Oracle Portal
 App Upgrades
 SQL Server
 Oracle Concepts
 Software Support

 Remote S
upport  
 Development  

 Implementation


 Consulting Staff
 Consulting Prices
 Help Wanted!

 


 Oracle Posters
 Oracle Books

 Oracle Scripts
 Ion
 Excel-DB  

Don Burleson Blog 


 

 

 


 

 

 
 

Oracle SQL profile Tips

Expert Oracle Database Tips by Donald BurlesonJanuary 7, 2015

Question: I understand that SQL profiles are used to lock down execution plans, but I don't understand how SQL profiles are used to tune SQL.  What are the features of SQL profiles and when are SQL profiles used?

Answer:  A SQL Profile is a bundle of improved optimizer statistics that is stored in the data dictionary.  SQL Profiles are create by running Automatic SQL Tuning.

Deploying SQL profiles can behave like optimizer plan stability to allow you to "swap" a bad execution  plan with a good execution plan!  SQL profiles allow you to tune vendor SQL without ever touching the application because SQL profiles intercept the SQL as it enters the library cache.

Just like stored outlines in the past, SQL profiles can be exported and imported.  Tips on migrating SQL profiles are available HERE.

SQL optimization is a complex subject, and SQL profiles are proving to be a key element in achieving a higher level of database optimization than was available in early versions of Oracle due to the limited ability of the DBA to impact the performance of poor application code.

An integral part of the SQL Tuning Advisor (STA), the SQL Profile is a collection of the historical information of prior runs of the SQL statement, comparison details of the actual and estimated cardinality, and predicate selectivity, etc. SQL Profile is stored persistently in the data dictionary, so it does not require any application code changes. 

SQL Profiles are one part the exciting Automatic SQL Tuning feature rolled out with version 11g.  This feature can automatically generate and implement SQL improvments at the discretion of the administrator.

Moving forward, SQL Plan Management will be key to locking down the SQL execution plans needed for optimal performance.

Additional information on SQL Profiles is available HERE.

 
Get the Complete
Oracle SQL Tuning Information 

The landmark book "Advanced Oracle SQL Tuning  The Definitive Reference"  is filled with valuable information on Oracle SQL Tuning. This book includes scripts and tools to hypercharge Oracle 11g performance and you can buy it for 30% off directly from the publisher.

 

 

Burleson is the American Team

Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

Verify experience! Anyone considering using the services of an Oracle support expert should independently investigate their credentials and experience, and not rely on advertisements and self-proclaimed expertise. All legitimate Oracle experts publish their Oracle qualifications.

Errata?  Oracle technology is changing and we strive to update our BC Oracle support information.  If you find an error or have a suggestion for improving our content, we would appreciate your feedback.  Just  e-mail:  and include the URL for the page.


                    









Burleson Consulting

The Oracle of Database Support

Oracle Performance Tuning

Remote DBA Services


 

Copyright © 1996 -  2016

All rights reserved by Burleson

Oracle ® is the registered trademark of Oracle Corporation.


 

��  
 
 
Oracle Training at Sea
 
 
 
 
oracle dba poster
 

 
Follow us on Twitter 
 
Oracle performance tuning software 
 
Oracle Linux poster