Here we have a collection of additions to the main article "Migration from Firebird to PostgreSQL. What can go wrong?", sent by community:
Another important aspect is transaction handling. It’s not only that PostgreSQL supports only one transaction per connection, but also that whenever an error occurs during a transaction, it is automatically rolled back. For example, if there’s a key violation error, the transaction is rolled back immediately.
In Firebird, however, we can handle an error, fix it within the same transaction, and continue without rolling everything back. This is a great feature, especially when importing large amounts of data, because it makes the process much easier.
Firebird offers an embedded mode that allows the database engine to run directly within an application or tool, eliminating the need for a separate server instance. In this configuration, the engine operates "inside" the host application by loading the Firebird engine as a dynamic link library (DLL). This means the host application—whether it's a Firebird utility like gbak.exe or a custom user application—directly loads and uses the database engine DLL within its own process space.
This embedded approach provides significant advantages for database operations such as backup and restore procedures. For instance, you can use gbak.exe to perform complete database backups and restorations without requiring a running Firebird server instance, making it ideal for standalone applications, development environments, or scenarios where a full server deployment isn't necessary.
We would like to thank community members which have sent their additions: Karol Bieniaszewski, Rodrigo Cantu.