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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
 

http://www.rampant-books.com/book_2003_2_OCP_print.htm


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