Database Management System

DBMS

• DBMS stands for Database management system.
• DBMS is a set of programs in an operating system that creates and maintains a database.
• Allow user to store and restive data from database.

• RDBMS stands for Relational for Database management system.
• In Relational data base management system everything is maintained in table format.
• Now a day’s relational database management system is most powerful.
• In Relational database management system maintains relationship between among the tables.
• Relational database management system is developed by Dr.E.F Codd in 1970.
  
  
  
  
• In picture demonstrates about a relational model. In relational database management system every data is stores in table.
• A table is combination of rows and columns.
• In relational database management system each Row is called as Tuple.
• In relational database management system each Column is called as Attributes.
• Every database is divided into number of tables and they are connected through the “Key Fields“.
• Data is in the form of a table. In table data is stored in form of rows and columns.
• “Key Fields“nothing but columns in a table.

Difference between DBMS and RDBMS

Now a day’s RDBMS is Replaces the DBMS because.

DMBS

In database management system Data is stored in single table.

If you want to update record in a table you need to update an entire database.

It is very time processing.

No relationships between among the tables in data base management system.

RDBMS

In Relational database management system Data is stored in multiple tables among with relationship using “Key Fields”.

If you want to update record in a table you need to update an single table only.

Comparing to DBMS RDBMS is Very fast.

Relationships exists in between among the tables in Relational data base management system.

(Student Personal Table)

(Marks Table)

In above

• In above Student Personal table and Marks table there is conman column is "Student_ID"
• Student_ID is called "Key Filed".
• if you want update the marks of the student you need to update only single table only.

Key Points RDBMS

• RDBMS stands for relational database management system.
• The model was developed by in IBM research scientist and mathematician Dr.E.F Codd in 1970.
• Provides facility Primary key, unique identify rows in table.
• RDBMS is most widely used in data model.
• Majority of current database used relational database management system.
• In Relational database management system data is stored in tables.
• Tables are combination of Rows and Columns.
• Rows are known as tuples.
• Columns are known as attributes.
• Each row in a table fixed number of attributes.
• It reduces the data redundancy and data integrity with in database system.
• Redundancy means avoid duplication of data.
• Integrity means valid data is stored in tables (By using constraints)