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Database Assignment Help

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Database System:
A database refers to a collection of data which is stored and accessed virtually. The data is stored in a structured and proper manner so that the users don’t face any difficulties insearching or modifyingit. A database is important because all the data and information needs to be stored somewhere where it can be used for modification or reviewingat a later stage. It is shared with different users at the same time by using a Database Management System (DBMS). DBMS helps users to maintain a good and functional database.

Types of Database
There are various types of database which are listed below:

  1. Commercial Database: A commercial database refers to a collection of data which can be presented electronically such as on TV. The user does not have theright to modify or change it. The only way to access this database isby using a commercial link.
  2. Operational Database: Operational Database is a database which is regularly updated such as online transactions, employee information,and customer information.This type of database is most commonly used in fields such as marketing, production, employee management etc.
  3. Centralized Database: As the name suggests, this database is accessed, stored and modified in a centralized location. The centralized location is often a central database system which can be accessed from a remote location.
  4. End-UserDatabase: End-User database is accessed by the end users of a software application through a query language. This database is generally shared among different users of different end user applications.
  5. Distributed Database: The basic feature offered by this database is that, the data is stored on multiple devices, either at the same location or over different devices spread across different locations and connected through a network. This common database is accessed and linked together with the help of a single communication link.
  6. Personal Database: This database is nothing but the data stored and maintained on personal or workingcomputers. Only the user is able to change or modify it as he is the only person who has an access to these files. This data can be shared with limited users via anetwork.

A Database is a broad field of information and knowledge and is divided into various sub-fields. We are a reputed database assignment help service, providing complete assignment help in all above-mentioned areas. We have experts who have advanced degrees from the top universities around the world and are highly-skilled and specialists in their respectivefields.

Advantages of Using Database

  1. Databases are commonly used by nearly every organization. It helps them to keep a regular update of important data such as Leave management, salary increments etc. This data is independent of the end users application.
  2. Using adatabase can reduce the duplication of the data which is stored at multiple locations. Therefore using shared database results in minimum data redundancy.
  3. It becomes easier to modify data thatis stored only in one location there by improving data consistency.
  4. Using database also improves data sharing among different users.
  5. Data is stored for a reason and the reason is that it has to be available when needed. Database enables quick accessibility and responsiveness to retrieve data.

Components of a Database Environment

  1. Computer Aided Software Engineering Tools: Basic Tools are needed to design and develop a database. These are automated tools which are used in this environment.
  2. Repository: A repository is an area where the data has to be stored. This area should be able to hold any data such as Excel spreadsheets, presentations, images, documents, programme files etc.
  3. Database Management System: DBMS helps a user to retrieve and access the database.
  4. Database: It is the collection of data stored. The common difference between repository and database is thatthe database contains the presence of data whereas; the repository contains the definition of the data.
  5. Application Programs: These programs are the end user applications which are used to provide the information to the users.
  6. User interface: User interface provides a platform through which a user interacts with various system components,used in a database environment.

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. This system becomes the interface between database and end user applications.It ensures that the data stored is substantially organized and easily accessible.

The data, database engine,and database structure are the three essential elements of a DBMS. Through the database engine, modification of datais enabled.The Database schema defines the database’s logical structure. It maintainsthe database in a structured fashion and data is maintained regularly in a consistent manner.

Types of Structures in Database

  1. 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.
  2. 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.
  3. 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.
  4. 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

  1. DBMS provides end-to-end user access to the data and at the same time uses it to modify or retrieve it.
  2. The greatest advantage of DBMS is that the data is secured and protected better thanany external source.
  3. Using DBMS, multiple users can access the data in a controlled manner.
  4. Multiple applications can be usedthe same database to store their data and manipulate it.
  5. 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.
  6. DBMS provides inbuilt integrity checks which ensures that the data is accurate and has high data integrity.
  7. 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:

Client server Architecture for database assignment help

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.

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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 organizes 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 columnof table is called ATTRIBUTES.

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