Which step should occur first when making changes to an existing data schema?

The first step when making changes to an existing data schema is to analyze which objects will be affected. This step is crucial for understanding the scope of the changes and their potential impact on the overall system. By identifying the specific data structures, relationships, and dependencies involved, you can make informed decisions about the changes that need to be implemented. This preliminary analysis helps to mitigate risks, allows for a clearer understanding of the required alterations, and sets the foundation for subsequent steps in the process.

Following this analysis, other important steps can be effectively carried out, such as backing up the current data structure, creating a detailed implementation plan, and notifying stakeholders. However, without first understanding which objects are affected, the risk of oversights increases, potentially complicating the change management process.