Call for Oracle support & training (800) 766-1884
Free Oracle Tips

Corporate Oracle Training
Custom Oracle Training
Oracle New Features Training
Advanced Oracle DBA Classes
Oracle Tuning Courses
Oracle Tips & Tricks
Oracle Training Links
Oracle Training Links
Oracle Training Links

We are top for USA Oracle Training Clients


Free Oracle Tips


Free Oracle App Server Tips


Oracle support

Oracle training

Oracle tuning


Remote Oracle

Custom Oracle Training


  Oracle Tips by Burleson

OCP Instructors Guide for Oracle DBA Certification

Chapter 7 - Tuning and Performance

Optimizer Dynamic Sampling

The values for optimizer_dynamic_sampling range from 0 to 10 with 0 telling the cost-based optimizer to not use dynamic sampling and the value 10 telling the optimizer to sample all blocks in the table.  The DYNAMIC SAMPLING hint can be used at the statement level to override the system setting defined by optimizer_dynamic_sampling.

Oracle recommends that dynamic sampling only be used when the time required to do the sample is a small fraction of the statement’s total execution time.  It’s a safe assumption that dynamic sampling will not be used in many OLTP systems but it may find a home in a few decision support and data warehouse environments.

The Oracle Database Performance Tuning (1Z0-033) certification test may have a question on Optimizer Plan Dynamic Sampling.  Test candidates should have a basic understanding of:

  • The benefits that Optimizer Plan Dynamic Sampling provides

  • When to use Optimizer Plan Dynamic Sampling

  • How to activate Optimizer Plan Dynamic Sampling

Data Segment Compression

Compressing data has been around since the inception of the database management system.  Data compression reduces the amount of data being stored, reduces memory usage (more data per memory block) and increases query performance.

The above text is an excerpt from:

OCP Instructors Guide for Oracle DBA Certification
A Study Guide to Advanced Oracle Certified Professional Database
Administration Techniques

ISBN 0-9744355-3-8

by Christopher T. Foot

Download your Oracle scripts now:

The definitive Oracle Script collection for every Oracle professional DBA


Oracle performance tuning book



Oracle performance tuning software

Oracle performance tuning software
Oracle performance Tuning 10g reference poster
Oracle training in Linux commands
Oracle training Excel


email BC:

Copyright © 1996 -  2014 by Burleson Inc. All rights reserved.

Oracle® is the registered trademark of Oracle Corporation.