Database Management System (DBMS) Database Management System is a collection of software application through which, users are able to modify or add information in the database. It can become easier to create, retrieve, update or manage data by using DBMS. The data, database engine,and database structure are the three essential elements of a DBMS. Through the database engine, modification of details enabled.
This system becomes the interface between database and end user applications.It ensures that the data stored is substantially organized and easily accessible.
The Database schema defines the database’s logical structure. It maintains the database in a structured fashion and data is maintained regularly in a consistent manner.
Types of Structures in Database
Hierarchical Database: The data is represented in the form of a tree structure. It has a single parent node which has relationships with various types of data.
Network Database: In this type of database, the data is represented in a flexible way. It is the other representative of the hierarchical structure. It also uses a tree-like structure but with multiple parent nodes.
Relational Database: This is mostly used by users as in this type of database the data between the file is relational. Thus it is easier to locate and access the data by using a common query.
Object-oriented Database: In this type of database, the objects are represented as the data which are used in object-oriented programming.
Advantages of Database Management Systems
DBMS provides end-to-end user access to the data and at the same time uses it to modify or retrieve it.
The greatest advantage of DBMS is that the data is secured and protected better than any external source.
Using DBMS, multiple users can access the data in a controlled manner.
Multiple applications can be used the same database to store their data and manipulate it.
It also provides an interface, through which, the data access becomes simpler.Hence,the user is required to employ only a simple query to reach out the data.
DBMS provides inbuilt integrity checks which ensures that the data is accurate and has high data integrity.
You can store large amounts of data in a database without any complexity.
Architecture of database System
There are two logical architecture; two tier client server architecture and three tier client server architecture.Basically, tier is the level of division i.e. in how many levels we divide the architecture. In two tier we divide into two levels of organization, similarly, in three tiers, we divide into three levels of organization.
Client server Architecture:
Whenever any kind of computation or data is required, client (an interface to the Server) makes request to the server. The server then replies back to the client with the computational result or the data.
Two tier architecture:
This is an architecture which is used when the client is running in a system and makes request directly to a server. The organization will be something like:
Whenever any computation or information is required client makes a request, for example to print, client makes a request to print server, for database, client makes request to DBMS server, and so on. In this case, almost every database vendor provides you with you an ODBS (Open Database Connectivity). Using this connector, we make a connection to the client and whenever required, we make a request to the server and it responds by replying.
Three tier architecture:
It consist of three levels which include-
In this architecture also, the client server method is used. Hence, whenever Client makes a request through GUI to server. Server handles the request and depending on it, it makes a request to Database server. All the business logic and quotes are kept on the Web Server. Afterwards, Database Server replies to the Web Server and Web Server renders those data as a page Almost all web applications use this architecture. However, this database level is kept unknown to the user. We provide database assignment help on data management, avail them today!
Database Software Paradigms-
A Database model is a model that determines the logical structure of a database. It basically determines the manner in which the data should be manipulated, stored, and organized.
Hierarchical Model: In this model, data is organized into a tree-like structure, implying a single parent for each record. It is efficient in managing any type of information. There is only one node entity at the top called Root.
Network Model: The network is an elaborated version of the hierarchical structure, giving access to many-to-many relationships through a tree-like structure, thus,allowing multiple parents.It organises data through two fundamental concepts; records and sets.
Entity-Relationship Model: This model was developed for database design by Peter Chen. An entity is a thing that exists either physically or logically. For example, car, house, book, etc. Entities are linked to each other through relationships.
Relational Model: It was first described in 1969 by E.F. Codd. In this model, data is stored in form of tables called relations. Each row of table holds one record known as TUPLE. Each column of table is called ATTRIBUTES.
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