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Oracle GoldenGate 11g Implementer's guide

You're reading from   Oracle GoldenGate 11g Implementer's guide Design, install, and configure high-performance data replication solutions using Oracle GoldenGate

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Product type Paperback
Published in Feb 2011
Publisher Packt
ISBN-13 9781849682008
Length 280 pages
Edition 1st Edition
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Author (1):
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John P Jeffries John P Jeffries
Author Profile Icon John P Jeffries
John P Jeffries
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Table of Contents (21) Chapters Close

Oracle GoldenGate 11 Implementer's guide
Credits
Foreword
About the Author
About the Reviewers
www.PacktPub.com
Preface
1. Getting Started 2. Installing and Preparing GoldenGate FREE CHAPTER 3. Design Considerations 4. Configuring Oracle GoldenGate 5. Configuration Options 6. Configuring GoldenGate for HA 7. Advanced Configuration 8. Managing Oracle GoldenGate 9. Performance Tuning 10. Troubleshooting GoldenGate GGSCI Commands
GoldenGate Installed Components
The Future of Oracle GoldenGate
Index

More about trail files


Trail files are used by Extract and Replicat processes, and their primary role is for data persistence. One could argue that writing files to what could be deemed as a "staging area" is wasteful and suboptimal. That said, GoldenGate writes to trail files in large blocks minimizing I/O. Furthermore, the architecture provides a guaranteed no data loss solution that is not to be underestimated.

The trail

By default, trail files are in canonical format being unstructured with a header record. Each record is of a variable record length containing the changed data. A trail can contain numerous trail files each having a two-character prefix with a 6 digit sequence number suffix.

An Extract process can write data to many trails. A Replicat can process data from one trail. However, it is possible to configure multiple Replicat processes to handle the workload.

Trail file purging

To "clean up" the processed trail files from a given trail to reduce disk space usage, configure the...

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