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

 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
 Oracle Support

 SQL Tuning

 Oracle UNIX
 Oracle Linux
 Remote s
 Remote plans
 Application Server

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

 Remote S


 Consulting Staff
 Consulting Prices
 Help Wanted!


 Oracle Posters
 Oracle Books

 Oracle Scripts

Don Burleson Blog 








New Shared Pool Features of Oracle 10gr2 (release 2)

Oracle Database Tips by Donald Burleson

Oracle has introduced some exciting load balancing features in 10g release 2, but there are also enhancements to the shared pool RAM structure in the SGA.

This whitepaper notes some enhancements to the shared pool in Oracle10g release 2.  There are two internal changes (extended chunk sizes and mutex) and enhancements to several of the v$ views:

Extended use of Standard Chunk sizes

In 10gR2, the server has been enhanced to further leverage standard chunk allocation sizes. This additional improvement reduces the number of problems arising from memory fragmentation.


To improve cursor execution and also hard parsing, a new memory serialization mechanism has been created in 10gR2. For certain shared-cursor related operations, mutexes are used as a replacement for library cache latches and librarycache pins. Using mutexes is faster, uses less CPU and also allows significantly improved concurrency over the existing latch mechanism. The use of mutexes for cursor pins can be enabled by setting the init.ora parameter _use_kks_mutex toTRUE.


As mentioned earlier, V$SGASTAT has been enhanced to display a finer granularity of memory to component allocation within the shared pool. This allows faster diagnosis of memory usage (in prior releases many smaller allocations were grouped under the ?miscellaneous? heading).


A new view, V$SQLSTAT has been introduced which contains SQL related statistics (such as CPU time, elapsed time, sharable memory). This view is very cheap to query even on high-concurrency systems, as it does not require librarycache latch use. It contains the most frequently used SQL statistics in the V$SQL family of views.


This implementation of this view has also been enhanced to be latchless, making it inexpensive to query.


The V$SQLAREA view has been improved in 10gR2; the view optimizes the aggregation of the SQL statements while generating the view data.


If you like Oracle tuning, you may enjoy the new book "Oracle Tuning: The Definitive Reference", over 900 pages of BC's favorite tuning tips & scripts. 

You can buy it direct from the publisher for 30%-off and get instant access to the code depot of Oracle tuning scripts.



Oracle Training at Sea
oracle dba poster

Follow us on Twitter 
Oracle performance tuning software 
Oracle Linux poster


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 -  2020

All rights reserved by Burleson

Oracle ® is the registered trademark of Oracle Corporation.