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View ArticleWhat Is Database Management System (DBMS)?
A database-management system (DBMS) is a collection of interrelated data and a set of programs to access those data. The collection of data, usually referred to as the database, contains information...
View ArticleWhat Is File Processing System? Disadvantages of It.
Before DBMS was invented, Information was stored using File Processing System. In this System, data is stored in permanent system files (secondary Storage). Different application programs are written...
View ArticleWhat is Data Abstraction in DBMS ?
The major purpose of a database system is to provide users with an abstract view of the system.The system hides certain details of how data is stored and created and maintained.Complexity should be...
View ArticleWhat Are Advantages & Disadvantages of DBMS ?
Advantages of DBMS:1.centralized management and control over the data:The database administrator having centralized control over the system.2.Reduction of Redundancies:Centralized control of data by...
View ArticleWhat Are Data Models In DBMS ?
Data modelsare a collection of conceptual tools for describing data, data relationships, data semantics and data consistency constraints. A data model provides a way to describe the design of a...
View ArticleWhat Are Instances And Schemas in DBMS ?
Instance : Collection of information stored in the database at a particular (instance of time) moment is called an instance of the database.Schema : The overall design of the database is called the...
View ArticleWhat Is Data Independence in DBMS ?
The ability to modify a schema definition in one level without affecting a schema definition in the next level is called data independence.There are two levels of data independence.Physical Data...
View ArticleTypes of DataBase Languages In DBMS.
Data sublanguage consists of two parts :Data Definition Language : To specify Database Schema.Data Manipulation Language : To express database queries and updates.1.Data Definition Language...
View ArticleImportant Terminologies of DataBase.
1. Transaction Management :Transaction is a collection of operations that perform a single logical function in a database application. It accesses and possibly updates the data items.Transaction...
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Components And Overall Structure of DBMS.
Components of DBMS are broadly classified as follows :1. Query Processor :(a) DML Compiler(b) Embedded DML pre-compiler(c) DDL Interpreter(d) Query Evaluation Engine 2. Storage Manager :(a)...
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Multi-User DBMS Architecture.
The architectures that are used to implement multi user DBMS are :TeleprocessingFile ServerClient Server1.11.1 Teleprocessing : Read more »
View ArticleWhat is Systen Catalogue in DBMS ?
System Catalogue : A repository of information describing the data in the database, that is the meta-data or data about data.Data Dictionary (also called system catalogue) stores meta-data that is,...
View ArticleIntroduction to DBMS Architecture.
Architecture of database system is greatly influenced by the architecture of computer system. This chapter deals with the following types of architecture of a database systems. Centralized System...
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What is Centralized System ?
Centralized systems run on a single computer system and do not interact with other computer systems.It is a single user database system which can be used on personal computer and also on the mainframe...
View ArticleWhat is Client-Server System ?
Client-server architecture is a system consisting of more than one nodes/machines. Generally, these types of systems consist of one node capable of executing all user applications and performing...
View Article2-Tier Client-Server Architecture.
Generally any business application requiring data consist of four major pillars viz. the actual database, the transaction logic, the application logic and user interface. To support ever increasing...
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