Introduction to RDBMS
RDBMS stands for Relational Database Management System. It is developed by E. F. Codd from 1970 to 1972. It stores data in the form of a table that makes the relation between the data, so it is named as an RDBMS. All modern database management systems like SQL servers, SQL, Oracle, MySQL, MS SQL are based on this relational database management system.
Definition
RDBMS is a Relational Database Management System. It is a type of Database which stores data in the form of tables.
How RDBMS Works?
Relational Database Management System stores data in the form of tables. It contains N number of tables and each table has its own unique primary key. Table consist of row and column. The row is known as a Record or horizontal entity. The record holds information about individual entry. The column is known as a field or vertical entity. The field holds information about a specific field. When the user fires a query it shows results as for specific queries. Before creating any table or data in the database, RDBMS check constraints
Below is the list of constraints
- Not Null: It is used to ensure that every column should not have null value i.e empty cell
- Unique: It is used to ensure that every column contains unique data.
- Check: It is used to ensure that every entry in column or row satisfies a specified condition
- Primary Key: It is used to identify each row of the table. The primary key must be unique. It must not contain null values. One table can only contain one primary key. It links two or more tables.
- Foreign Key: It links two tables. It is filed in one table that refers to a primary key that is located in another table. In other words, it makes a relation between two tables which contain the primary key. Tables can link with each other using these two keys.
- Data Integrity: RDBMS checks the integrity of data before creating data. Below is the list of categories through which it checks the integrity of data.
- Entity Integrity: It is used to ensure that there is no duplicate row in the table.
- Referential Integrity: It ensures that the rows that re-linked with other tables cannot be deleted.
- Domain Integrity: It ensures the entry of data in table based on specific condition like file format, the rage of values, etc.
- User-Defined Integrity: It ensures that integrity in the table satisfies the user-defined conditions.
Advantages of RDBMS
Below are the few advantages of RDBMS as follows –
1. Maintainability
It provides easy usability. It allows database admins to maintain, control, update, data into the database easily. With RDBMS backing up of data becomes easy. Automation tools of RBDMS automate these tasks.
2. Flexibility
This feature of RDBMS saves a lot of time as updating data at one place is enough. For example, suppose you have data from students, and you have to update one student’s detail. In that case, you just have to update that detail in the main table rather than updating in every file, it automatically updates that information in every file of the database.
3.Data Structure
As RDBMS stores data in a table format, it is easily understood by the users. Data are organized in a structured manner and matches entries by firing queries.
4. Privileges
This feature of RDBMS allows database administrators to control activities over the database. Administrators can give specific access to a user rather than giving all Access. Administrators can also stop user access.
Why do we Need RDBMS?
1. Data Safety – RDBMS provides Data Safety. data will be safe when the program crashes by authorization codes, other security layers.
2. Fault Tolerance: It provides Fault Tolerance by replicating Database which helps when the system crashes because of sudden power failures, accidental shutdown, etc. It also provides Concurrent Access.
3. Ease of Use: Accessing and managing the data becomes easy while working with RDBMS by using the tables to store data in columns and rows
4. Scalability– It can handle any amount of quantities of data in a uniformly. In RDBMS, indexes are used to sort data and speed up performance.
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Why Should we Use RDBMS?
We should use RDBMS because of the following things
- In relational database management systems, all the data are stored in the form of tables.
- In the table, all data is stored in the form of rows and columns which facilitates efficient management of data.
- To store sensitive data, it provides a virtual table creation feature.
- A used primary key to identify each row uniquely.
- Used foreign key to link column with two or more tables.
- To retrieve data at high speed provides an index creation feature.
- Provides multi-user access i.e. system can be handled by multiple users.
These are the reasons why relational database management system is used across the world.
How this Technology will Help you in your Career Growth?
The relational database management system is the most widely used database system that is used across the world. As this popular and used in many areas, learning this technology will help you to get a good job position in the organization and help you to compete with others and stand in the market at the top.
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