You are developing a Spring Boot application that needs to interact with multiple databases. How would you design the data source configuration and connection pooling to ensure optimal performance and maintainability?

To ensure optimal performance and maintainability when interacting with multiple databases in a Spring Boot application, using dynamic data source routing with a common connection pool configuration is recommended. This approach allows for efficient database interactions, as requests are routed to the appropriate data source based on the context. It also simplifies maintenance by centralizing the connection pool configuration. Configuring separate data sources for each database can lead to complexity, and a single global connection pool may not provide isolation for each database. Programmatically routing requests adds unnecessary complexity.