▪ A bank might keep all of its account information in a central database. Branch offices might get subset of the data for customers who use that particular branch.

▪ Mobile sales people or repair people might keep copies of a subset of customer information or product information about their mobile computing devices, while a central office keeps a complete set of the data.

▪ A rack of telecommunications equipment can hold many line cards, each with its own memory. One card can act as the master, assigning connections to specific line cards. Other line cards can act as replicas, each handling a subset of the connections. Each card might be responsible for, for example, a particular range of network addresses.

▪ A content provider might keep a complete set of files (movies, music, and so on), which could be downloaded to individual consumers for their use. This type of application is not limited to one-to-many relationships. Customers could have relationships with multiple content providers, so that there is a many-to-many relationship between content providers and customers.