what are typical function of Data Base system?

Answer 1

collection of programs that enables you to store, modify, and extract information from a database. There are many different types of DBMSs, ranging from small systems that run on personal computers to huge systems that run on mainframes. The following are examples of database applications:
computerized library systems
automated teller machines
flight reservation systems
computerized parts inventory systems

Answer 2

check this site:
http://en.wikipedia.org/wiki/Database_management_system
look under "Features and Abilities"

this might be useful.

Regards;