Oracle GoldenGate is a powerful tool used for real-time data replication between databases. One of its key components is the trail file, which stores the changes captured from the source database before sending them to the target.

But what if you’re using GoldenGate version 12.2 and need to send data to a system running an older version of GoldenGate? You’ll need to format the trail files in a way that the older version can understand.

Let’s break this down in simple terms.

🔧 What Is a Trail File?

A trail file is like a logbook. It records every change made to the source database (like insert, update, delete operations). GoldenGate uses these files to replicate data to another system.

🕵️‍♂️ The Problem with Version Differences

GoldenGate versions are not always compatible with each other. A trail file created in version 12.2 might contain features or formats that older versions (like 12.1 or 11.2) don’t recognize. This can cause replication to fail.

✅ The Solution: FORMAT RELEASE

Oracle GoldenGate provides a simple way to make trail files compatible with older versions using the FORMAT RELEASE parameter.

This tells GoldenGate to write the trail file in the format of an older version.

📝 How to Use FORMAT RELEASE

You use this parameter in the Extract or Data Pump process configuration.

Here’s an example:

EXTTRAIL ./dirdat/et
FORMAT RELEASE 11.2

This tells GoldenGate to create trail files in the format used by version 11.2.

You can also use:

FORMAT RELEASE 12.1

Depending on the version you want to support.

📌 Important Notes

• Always match the trail file format with the target GoldenGate version.
• Use FORMAT RELEASE in the Data Pump if you’re using one.
• This helps avoid compatibility issues and ensures smooth replication.

🧠 Summary

If you’re using Oracle GoldenGate 12.2 and need to send data to a lower version:

1. Use the FORMAT RELEASE parameter.
2. Set it to the version of the target GoldenGate system.
3. This makes the trail file readable by the older version.