Database is a set / collection of a complete operational data from an organization / company that is managed and stored in an integrated way by using a specific method to use a computer so as to provide the information necessary optimal wearer.

Basic components of database systems :

• Data, Data in a database can be stored in an integrated and data can be used together.
• Hardware, consisting of all the computer equipment used for the management of database systems, such as:
  – Equipment for storage of the data base, the secondary storage
  – Input and output devices
  – Data communication equipment
• Software, Functioning as an interface between a user with physical data in the database.
• User or users, user database is divided into three classifications, namely:
  • Database Administrator (DBA)
    person or team in charge of managing database system as a whole.
  • Programmer
    person or team in charge of making the application program.
  • End Users
    who access the database via the terminal with using a query language or program application made by programmer.

Database System Advantages :

• Reduce data redundancy, ie the same data stored in data files that are different, so updates are performed repeatedly.
• Prevent inconsistencies.
• Data security can be maintained, which can be protected from unauthorized users.
• Data integrity can be maintained
• Data can be used together
• Provides recovery
• Facilitate the application of standardization
• Data independence

Disadvantages Database System :

• Plenty of storage space required
• Skilled labor required to manage data
• Expensive software
• Damage in the database system can affect the departments concerned.