Introduction to Database

INTRODUCTION TO DATABASE:

Before knowing database one must know about data.

Data: In simple words data can be facts related to any object in consideration. For example your name, age, height, weigh, etc are some data related to you. A picture , image , file , pdf etc can also be considered data. So data is everything which needed memory or in device.

Database: Database is a systematic collection of data. Or we can say a database is a collection of information that is organized so that it can be easily accessed, managed and updated.

• In Database a data is organized into rows, columns and tables. 
• In database data is indexed to make it easier to find relevant information. 
• In Database data gets updated, expanded and deleted as new information is added. 
• Databases process workloads to create and update themselves, querying the data they contain and running applications against it.

In Database access to data is usually provided by a "database management system" (DBMS).

A DBMS is an integrated set of computer software that allows users to interact with one or more databases and provides access to all of the data contained in the database.

Some examples of Database software programs are:

1. Microsoft Access.
2. Microsoft Excel.
3. Microsoft SQL Server.
4. MySQL.
5. Oracle RDBMS.

Why do we need Database?

The various reasons for which we require databases are:

• To manage large amount of data.
• To manage the accuracy.
• It provides ease of updating data.
• Databases provides security groups and permission to data.
• Databases assured of accuracy and consistency of data due to the built in integrity checks and access controls.

Some applications using database:

1. Facebook
2. Amazon
3. eBay
4. Microsoft Access
5. Wikipedia
6. YouTube
7. Airlines ticket systems
8. IRCTC
9. Flipkart
10. Snapdeal

More topics from DBMS to read:

EasyExamNotes.com covered following topics in these notes.

1. Introduction to Database
2. Introduction to DBMS
3. Advantages and disadvantages of DBMS
4. DML, DDL and DCL
5. Domains
6. Introduction to data models
7. Entities and Attributes
8. Relationship among entities 
9. Tuples
10. Attributes
11. Relation
12. Keys
13. Relational Database
14. Twelve rules of CODD
15. Schemas
16. Integrity Constraints
17. Normalization
18. Functional dependency
19. Transaction processing concepts
20. Schedule
21. Serializability
22. OODBMS vs RDBMS
23. RDBMS
24. SQL join
25. SQL functions: SUM(), AVG(), MAX(), MIN(), COUNT().
26. Block, Extent, Segment
27. Oracle Background processes
28. Trigger
29. Oracle cursor
30. Introduction to Concurrency Control

A list of Video lectures

• Click here

References:

1. Korth, Silbertz,Sudarshan, “Fundamental of Database System”, McGraw Hill
2. Atul Kahate , “ Introduction to Database Management System”, Pearson Educations