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 Replication Tips by Burleson

Oracle materialized view conflict resolution

master site but cannot be applied at another site.  At this point, the replicated tables no longer contain the same data.

Key conflicts are just one possible type of replication conflict.  When a receiver applies a transaction from the deferred transaction queue, it checks the before image to insure that the table data is still the same.  What happens when one row of data is updated at two remote sites at the same time?  The first update propagates normally and is applied, the second update follows and, because it expects the before image to be the original data, it fails to be applied.  The before image is changed by the first update.  This is called an update conflict. 

A delete conflict is similar; one site updates a row while another site deletes the row.  If the update propagates first, the delete fails because the before image does not match.  If the delete propagates first, the row no longer exists when the update is applied.  As you can see, getting your replication environment to function is just the beginning.  To keep it operating, you need to plan for conflict avoidance and apply a method of conflict resolution.

This is an excerpt from Oracle Replication By Rampant TechPress (only $19.95).  You can click here to order a copy and get instant access to the code depot:

Get a Personal Oracle Replication Mentor

The author is now offering personal mentors for Oracle DBAs where you can have an Oracle expert right at your fingertips, anytime day or night. We work with hundreds of Oracle databases every year, so we know exactly how to quickly assist you with any Oracle replication question. 

You can get me personally, or any Oracle Certified replication DBA with more than 20 years of full-time IT experience. 




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.