What is a disadvantage of a disconnected access model?

A disadvantage of a disconnected access model is primarily related to the challenge of managing data consistency. In this model, data is retrieved from a central database, but once the data is in the client application, it can be modified independently of the central database. This disconnection means that any changes made locally may not reflect concurrent changes made by other users to the central database. As a result, maintaining synchronization and consistency across various copies of the data becomes complex, leading to potential discrepancies when the data is reconnected to the database.

In contrast to this model, a connected model allows for real-time data interactions, which can help maintain consistency and synchronization. However, this connected model may not scale well or accommodate many users effectively, which is contrary to the premise of the disconnected model allowing greater user access and scalability. Therefore, the difficulty in managing data consistency in the disconnected access model stands out as a significant disadvantage.