What Are The Features Of Rdbms?

A data table within an RDBMS has rows (actual data values) and columns (organising the data).

If you declare a particular column to have keys then every data entry in that column has to be unique, and can be used to identify the row

keys can also be used to link tables - have the same data value in another table's column, along with a row of other stuff

RDBMS stands for a relational database management system. It is a database management system that is based on a relational model introduced by famous professor EF Codd. The most common database in use today is the RDBMS. Another short version of RDBMS is DBMS.

A transaction of RDBMS is called a database transaction. It is a unit of interaction with a DBMS or something similar that is treated in a coherent and in any reliable way is it independent of other transactions that must be entirely completed or completely aborted. Usually a DBS will guarantee all the properties of ACID or in other words, atomicity, consistency, isolation and durability for each transaction.

EF Codd is a British scientist who has made a lot of contributions in the world of database theory.

Database management system will have a certain structure, composed of a collection of data, it mainly has the following characteristics:

1. Data, structured data in the database is not a haphazard and irrelevant, and they have a solid organizational structure, belonging to the same set of data with similar characteristics.

2. Data sharing in a unit of the various departments, there are a lot of duplication of information. The purpose of the use of the database is to unified management of information, reduce redundancy, so that the various departments shared the same data.

3. Data on the independence of the independence of the data refers to data records and data management software between the independence. Data and its structure should be independent and should not be to change the application.

4. The integrity of the data integrity of the data is to ensure the accuracy of the data in the database. May result in incorrect for various reasons, the database management system through the nature of the data checks and manage them.

5. Data on the flexibility of database management systems is not a simple accumulation of the data, it is the basis of information in the record data that has a lot of management functions, such as input, output, query, edit, modify and so on.

6. Data security based on user responsibilities, different levels of people with different permissions on the database, database management system should ensure data security.