Brief History of Database and DBMS
Due to the advancement in the electronic industry, the increased processing and storage capacity of computer has opened the doors for computer scientists to develop various techniques to store large amount of related data in an efficient and compact manner. The concept of database was introduced by IBM in 1960s. A brief description about the development of DBMS and database models is given below:
- Hierarchical DBMS
- Network DBMS
- The network schema, which represents the logical organization of the entire database as seen by the DBA. It includes a definition of the database name, the type of each record, and the components of each record type.
- The sub-schema, which represents the part of the database as seen by the user or application program.
- A Data Management Languages, which is used to define the data structure, and the to manipulate etc.
- A schema Data Definition Language (DDL), which enables DBA to define the schema.
- A sub-schema DDL, which allows the application programmers to define the parts to the database they require.
- A Data Manipulation Language (DML), to manipulate the data of database.
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