Schema migrations without application downtime

Coming soon — this article is being prepared. Below are its question, intended outcome, and place in the story.

The question

How can you change a schema while old and new code coexist?

What we will work through

Change a schema while old and new code coexist.

Before you begin

Previously covered: Foreign keys and entity relationships; A transaction for a business operation.

• Foreign keys and entity relationships
• A transaction for a business operation