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

Home
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


 
HTML Text AOL

Free Oracle App Server Tips


 
HTML Text

Oracle support

Oracle training

Oracle tuning

Rednecks!

Remote Oracle

Custom Oracle Training

 

   
  Oracle Tips by Burleson

Oracle Streams
Chapter 2 - Streams Components and Processes

Row LCRs

A row LCR describes a change to the data in a single row or a change to a single LONG, LONG RAW, or LOB column in a row. The change in rows is caused by a DML statement or a piecewise update to a LOB.

A single DML statement may insert or merge multiple rows into a table, may update multiple rows in a table, or may delete multiple rows from a table. In this situation, a single DML statement would produce multiple row LCRs. That is, a capture process creates an LCR for each row that is changed by the DML statement. Also an update to a LONG, LONG RAW, or LOB column in a single row may result in more than one row LCR.

Each row LCR is encapsulated in an object of lcr$_row_record type and contains the old and new values of the row. It also has many attributes that identify the source name, command type, SCN, and object name. A captured row LCR also contains transaction control statements such as the COMMIT and ROLLBACK. Such row LCRs are internal and are used by an Apply process to maintain transaction consistency between a source database and a destination database.

A full list of the attributes shown below:

  • source_database_name - This is the name of the source database where the row change occurred.
     

  • command_type - This is the type of DML statement that produced the change, either INSERT, UPDATE, DELETE, LOB ERASE, LOB WRITE, or LOB TRIM.


The above text is an excerpt from:

Oracle Streams
High Speed Replication and Data Sharing

ISBN 0-9745993-5-2

by Madhu Tumma
 


Download your Oracle scripts now:

www.oracle-script.com

The definitive Oracle Script collection for every Oracle professional DBA

 
 
 

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.