Updating your database development
But the idea is always the same: You have a bunch of instances of a subsystem and you shutdown, update, and restart one instance after the other.
While doing that, you run the old and the new version of your application in parallel.
Let’s take a closer look at the backward-compatible operations first.
Backward-compatible operations are all operations that change your database in a way that it can be used by the old and the new version of your application.
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That means that all migrations need to be backward-compatible as long as you’re running at least one instance of the old version of your application.
But that changes if your customers don’t accept any downtime.
Simple changes, like removing a column or renaming a table, suddenly require a multi-step migration process.
These old instances, obviously, don’t write any data to the new tables.
You might need to clean up your data and add the missing records to the new table after all application instances have been migrated. You don’t need to worry if you add a database column without a not null constraint.But you need to check if there are any old use case implementations that would break if any database record doesn’t fulfill the constraint.
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