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 


 

 

 


 

 

 
 

 Create index Performance Speed Tips

Oracle Database Tips by Donald BurlesonMarch 8, 2015

Question:  I am getting slow performance speed when creating an index on a very large table.  What are the ways to speed-up the creation of an index in Oracle?

Answer:  Creating an index involves a full scan against the target table and a sort, so whatever you can use to speed-up these operations will speed-up the performance of a "create index" statement.  These performance improvements for index creation include:

- Make a huge PGA:  Dedicating a huge RAM region to sorting will avoid a sort to disk, thereby improving to elapsed time required to create a very large index:

alter system set pga_aggregate_target=16G;
alter system set "_pga_max_size"=2000000000;

create index xxx . . .

- Use parallel query:  You can use parallel query to speed-up the index build by improving the speed of the retrieval of the rows from the target table.  Ther is an added performance benefit with parallel create index because each parallel query process gets its own PGA RAM, thereby increasing the sort area size and making the index build run far faster.  The best way is to use a "parallel" hint:

create index /*+ parallel 35 */ xxx . . .

- Use a partitioned index:  You should always partition a very large table, and partition the index.  This improves the performance of both index queries (partition pruning) and index creation in parallel.  See my notes on global vs. local partitioned indexes for more details.

- Use NOLOGGING:  You can use the NOLOGGING option to improve the performance of an index creation.  Beware that there are special considerations with nologging.

create index xxx . . . NOLOGGING . . . 

   
Oracle Training from Don Burleson 

The best on site "Oracle training classes" are just a phone call away! You can get personalized Oracle training by Donald Burleson, right at your shop!

Oracle training
 
 


 

 

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 -  2017

All rights reserved by Burleson

Oracle ® is the registered trademark of Oracle Corporation.

Remote Emergency Support provided by Conversational

 

 

��  
 
 
Oracle Training at Sea
 
 
 
 
oracle dba poster
 

 
Follow us on Twitter 
 
Oracle performance tuning software 
 
Oracle Linux poster