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 support
 Remote plans
 Remote services
 Application Server
 Applications
 Oracle Forms
 Oracle Portal
 App Upgrades
 SQL Server
 Oracle Concepts
 Software Support
 Remote Support  
 Development  
 Implementation


 Consulting Staff
 Consulting Prices
 Help Wanted!

 


  Oracle Posters
 Oracle Books
  Oracle Scripts
 Ion
 Excel-DB  

Don Burleson Blog 


 

 

 


 

 
   

 

  Oracle Database Tips by Donald Burleson

Oracle10g Grid Computing with RAC
Chapter 7 - Cache Fusion and Inter Instance Coordination

 Shared Pool and Large Pool

The large pool is useful to allocate large memory allocations for:
  • Session memory for the shared server and the Oracle XA interface (used where transactions interact with more than one database)
     
  • I/O server processes.

     
  • Oracle backup and restore operations - recovery manager can use the large pool to cache I/O buffers during backup and restore operations.
     
  • Parallel execution message buffers, when the initialization parameter parallel_automatic_tuning is set to TRUE.
Redo Log Buffers

A log buffer is a circular buffer in the SGA that holds information about changes made to the database. This information is stored in the redo entries. Redo entries contain the information necessary to reconstruct or redo changes made to the database by insert, update, delete, create, alter, or drop operations. Redo entries are primarily used for database recovery as necessary.

The server processes generate redo data into the log buffer as they make changes to the data blocks in the buffer. LGWR subsequently writes entries from the redo log buffer to the online redo log.

Database Buffer Cache

The database buffer cache holds copies of data blocks read from the data files. The term 'data block' is used to describe a block containing table data, index data, clustered data, and so on. Basically, it is a block that contains data. All user processes concurrently connected to the instance share access to the database buffer cache. The database buffer cache is logically segmented into multiple sets. This reduces contention on multiprocessor systems.
 

The above text is an excerpt from:

Oracle 10g Grid & Real Application Clusters
Oracle 10g Grid Computing with RAC
 ISBN 0-9744355-4-6

by Mike Ault, Madhu Tumma

 

   
��  
 
 
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.