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


Oracle Consulting Support
Oracle Upgrades
Use New Oracle Features
Oracle Replication Support
Oracle Training
Remote Oracle DBA
System Documentation
Oracle Tips
Oracle Performance
 

Free Oracle Tips


 

HTML Text

BC Oracle tuning

Oracle training

Oracle support

Remote Oracle

 

 

 
 

Porting To Parallel Server

Oracle Tips by Mike Ault


Master-Master Replication

In a master-master replication situation both databases are independent entities which maintain a full n-way replication on all tables. This n-way replication allows both databases to be used as fully active databases and all changes to data are copied between both systems. Master-Master n-way replication is complex to manage and conflict resolution strategies must be created for all update capable tables. In addition, master-master replication may require additional bandwidth for the network that connects the platforms used. One good feature of n-way or master-master replication is that if it is properly implemented you can use different system platforms in remote locations.

Full Database Copy

In a full database copy situation a full hot backup of the active database is copied from its platform to the backup site and there it is restored as if from a disaster. A full database copy provides a backup copy of the database but it is only current to the copy date. If any activity is allowed against the database that results form the copy operation, then the databases are thrown out of sync and a new copy must be made if the databases are to truly back each other up. The time required for this full database copy operation can be prohibitive for large databases. Figure 2 shows an example of this option.


For more information on this topic, I recommend Don Burleson's latest book "Oracle Tuning: The Definitive Reference". 

You can buy it direct from the publisher for 50%-off and get instant access to the code depot of Oracle tuning scripts:

http://www.rampant-books.com/book_1002_oracle_tuning_definitive_reference_2nd_ed.htm


Download your Oracle scripts now:

www.oracle-script.com

The definitive Oracle Script collection for every Oracle professional DBA

 

 

  
 

Oracle performance tuning software 
 
 
 
 

Oracle performance tuning book

 

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

 

   

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

Oracle® is the registered trademark of Oracle Corporation. 

Hit Counter