Implementing Azure DevOps Solutions

Adding a process

As the previous section illustrated, it is important to think about how and when changes to the database schema or the application (or applications!) that use that schema are applied. But no matter how the deployment of schema changes and code deployment are scheduled, there will always be a period at which one of the following is true:

• The new application code is already running while the schema changes are not applied yet or are in the process of being applied.
• The old application code is still running while the schema changes are already applied or are in the process of being applied.
• The application code is not running while the schema changes are being applied.

The third situation is highly undesirable. This is true ...