How to Restore a Progress Database Including Sequences

Описание: Learn how to effectively restore a Progress DB with associated sequences and troubleshoot common issues. This guide provides clear steps to ensure your database is fully restored without missing sequences.
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This video is based on the question https://stackoverflow.com/q/67090779/ asked by the user 'JulesVerne' ( https://stackoverflow.com/u/8763171/ ) and on the answer https://stackoverflow.com/a/67091333/ provided by the user 'Tom Bascom' ( https://stackoverflow.com/u/123238/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Restore a Progress Database Including Sequences: A Step-by-Step Guide

Restoring a database can often be daunting, especially when it involves ensuring that all components—including sequences—are intact. If you've been using Progress OpenEdge and have backed up your database using after-imaging, chances are you've come across the challenge of restoring your database to a local PC with all its features in place.

In this blog, we’ll explore the process of restoring a Progress database and clarify how to ensure that your sequences are correctly restored too. Let’s dive into the solution!

Understanding the Problem

When you restore a Progress database, you might notice that the sequences in your database are starting from one or zero after the restoration. This unexpected behavior raises a few questions:

Where did the sequences go?

Why are they starting at unexpected values?

Is there a process to recover the original sequence values?

Many users encounter this issue, and it can often be attributed to a misunderstanding of how sequences work in the database restoration context.

Step-by-Step Solution

1. Know Your Sequences in the DB

First, it's essential to understand what sequences are in the context of a Progress database:

DB Sequences: These are integral to the database schema and typically used for functionalities like auto-incrementing fields. They should automatically restore with the database if the restoration process is successful.

After Image (AI) Sequences: This pertains to the organization of archived after-image logs and is crucial for data integrity during the restoration process.

2. Restoration Commands Overview

The commands you're using to restore your database might look something like this:

[[See Video to Reveal this Text or Code Snippet]]

3. Troubleshooting the Sequence Issue

If the sequences are not restoring correctly, there are a few steps to check:

Log Files: Examine the db.lg file. This file provides critical messages regarding the restoration process and can indicate if something went wrong during restoration.

Confusion Between Sequence Types: Ensure that you differentiate between DB sequences and AI sequences. DB sequences should restore automatically, while AI sequences are reset when after-imaging is enabled.

4. Enabling After Imaging Again

Once the database is restored, the next crucial step is to re-enable after-imaging to ensure the sequences start tracking again. After-imaging needs to be activated to prevent AI sequence numbers from being reset:

[[See Video to Reveal this Text or Code Snippet]]

5. Rechecking After Restoration

After completing the restoration process and enabling after-imaging, it's a good practice to check:

Sequence Integrity: Confirm that sequences are functioning as expected in your database applications.

After-Image Management: If you manage AI sequences manually, include sequence numbers in the file names for better tracking.

Conclusion

Restoring a Progress DB, especially with a focus on sequences, involves understanding the fundamentals of database schemas and after-image logs. If you follow these steps and clear up any confusion regarding sequences, you can confidently restore your database while ensuring that all components are intact.

If you encounter further issues, revisiting your log files and understanding your restoration commands are crucial to identifying problems. With the right knowledge, restoring a Progress database can become a seamless task.

Happy restoring!