Database Management System(DBMS)

Data can be defined as raw facts and figures that can be organized later on. Database is the collection of coherent meaningful data. The full form of DBMS is Database Management System. It is the grouping of related data, records whereas management system is the collection of programs for saving and retrieving the data records. DBMS can be defined as collection of programs which are required to store as well as access the data in efficient and easy way.

Introduction

Hierarchical DatabaseNetwork DatabaseRelational DatabaseObject Oriented Database

Different Types of DBMS

The information processing is part into unmistakable parts. A section is either requester (client) or supplier (server). One or more requests has been sent to the client to the server during data processing in order to perform determined tasks. The server part give the services to the client side.

Client Server Architecture in Database

Data consistently incorporated (i.e., access in light of one pattern)

Data physically distributed among numerous database nodes

Processing is distributed among numerous database hubs

Distributed DBMS

Reflects hierarchical structure

Improved share capacity

Improved accessibility

Improved reliability

Improved execution

Advantages of DDMS

Single column index – It is created on single table column. Syntax – Create index index_name On Table_name (column_name);Unique Index – It is used for data integrity. It doesn’t allow

duplicate values to be entered in the column. Syntax - Create UNIQUE index index_name On Table_name (column_name);Composite Indexes – It is created on two or more columns

of a table. Syntax - Create index index_name On Table_name (column1, column2);Implicit Indexes – These are automatically created by

database server on the creation of object.

Different types of Indexes

A network database model is a database model that permits various records to be connected to a similar proprietor document. The model can be viewed as a top down tree where the branches are the part data connected to the proprietor, which is the base of the tree.

Network Database Model

Data concurrency implies that numerous clients can access information in the meantime. The complete isolation of simultaneously running transactions could imply that one transaction couldn't perform insert into a table that is being queried by another transaction.

Database Concurrency

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