Book Image

IBM InfoSphere Replication Server and Data Event Publisher

By : Pav Kumar-Chatterjee, Pav Kumar Chatterjee
Book Image

IBM InfoSphere Replication Server and Data Event Publisher

By: Pav Kumar-Chatterjee, Pav Kumar Chatterjee

Overview of this book

Business planning is no longer just about defining goals, analyzing critical issues, and then creating strategies. You must aid business integration by linking changed-data events in DB2 databases on Linux, UNIX, and Windows with EAI solutions , message brokers, data transformation tools, and more. Investing in this book will save you many hours of work (and heartache) as it guides you around the many potential pitfalls to a successful conclusion. This book will accompany you throughout your Q replication journey. Compiled from many of author's successful projects, the book will bring you some of the best practices to implement your project smoothly and within time scales. The book has in-depth coverage of Event Publisher, which publishes changed-data events that can run updated data into crucial applications, assisting your business integration processes. Event Publisher also eliminates the hand coding typically required to detect DB2 data changes that are made by operational applications. We start with a brief discussion on what replication is and the Q replication release currently available in the market. We then go on to explore the world of Q replication in more depth. The latter chapters cover all the Q replication components and then talk about the different layers that need to be implemented—the DB2 database layer, the WebSphere MQ layer, and the Q replication layer. We conclude with a chapter on how to troubleshoot a problem. The Appendix (available online) demonstrates the implementation of 13 Q replication scenarios with step-by-step instructions.
Table of Contents (12 chapters)
IBM InfoSphere Replication Server and Data Event Publisher
Credits
About the Author
About the Reviewer
Preface

WebSphere MQ message format


Each WebSphere MQ message consists of two parts: a header and the application data.

There are five types of header, as shown in the following table

MQMD

The message descriptor. Created by the application at message create time.

MQXQH

The Transmission Queue header, which contains delivery information in remote queuing.

MQDLH

The dead letter header, which identifies conditions that prevent delivery to a destination queue.

MQRMH

Reference message header, which contains information to assist in delivery of reference messages.

IMSrtm

Information header (MQIIH), which is carried with the message using the IMS hierarchical database bridge facility.

Let's look at the MQMD header in more detail. The following figure shows how the MQMD is made up:

The following table shows the meaning of each MQMD entry in the preceding figure:

1

The queue name for reply messages.

2

If we cannot deliver this message, put it in the DLQ or discard (DLQ is the default).

3

Is the...