Nowadays, information systems generally use databases to store data, the use of databases can be efficient management of data, including the effective organization of data, querying and modification, as well as easy to achieve backup and recovery.

1, store data, which is the minimum. File storage is not impossible, but for concurrency support, locking mechanism to protect, storage and backup mechanism, search, the database is at a huge advantage

2, data storage more, often find some new knowledge. This is the data warehouse, data mining do

3, now popular big data? Cloud computing? All have the support of the database ah