In a one-tier model, where do the database and applications reside?

In a one-tier model, both the database and the applications reside on the same system. This architecture is characterized by having all components, including the user interface, application logic, and database management, operating on a single platform. As a result, it provides a simplified structure where users can directly interact with the applications and their associated data without requiring separate servers or complex networking configurations.

This model is particularly useful for smaller applications or environments where ease of installation and management is a priority since everything is hosted locally. It allows for quick access to the database by the application, which can enhance performance for local users or for scenarios where network latency might be a concern. The integration of all components on a single system also allows for lower overall costs in terms of hardware and maintenance compared to multi-tiered architectures.