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DATABASE CONCEPTS
A
Database is a collection of related data organized in a way that data
can be easily accessed, managed and updated. Any piece of information can be a
data, for example name of your school. Database is actually a place where
related piece of information is stored and various operations can be performed
on it.
DBMS
A
DBMS is software that allows creation, definition and manipulation of
database. Dbms is actually a tool used to perform any kind of operation on data
in database. Dbms also provides protection and security to database. It
maintains data consistency in case of multiple users. Here are some examples of
popular dbms, MySql, Oracle, Sybase, Microsoft Access and IBM DB2 etc.
Components of Database System
The
database system can be divided into four components.
- Users: Users may be of various type such as DB administrator, System developer and End users.
- Database application : Database application may be Personal, Departmental, Enterprise and Internal
- DBMS : Software that allow users to define, create and manages database access, Ex: MySql, Oracle etc.
- Database : Collection of logical data.
Functions
of DBMS
- Provides data Independence
- Concurrency Control
- Provides Recovery services
- Provides Utility services
- Provides a clear and logical view of the process that manipulates data.
Advantages of DBMS
- Segregation of application program.
- Minimal data duplicacy.
- Easy retrieval of data.
- Reduced development time and maintenance need.
Disadvantages of DBMS
- Complexity
- Costly
- Large in size
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