DATABASE: A database is an organized collection of data. The data is typically organized to model relevant aspects of reality (for example‚ the availability of rooms in hotels)‚ in a way that supports processes requiring this information (for example‚ finding a hotel with vacancies). A general-purpose database management system (DBMS) is a software system designed to allow the definition‚ creation‚ querying‚ update‚ and administration of databases. Well-known DBMSs include MySQL‚ PostgreSQL‚ SQLite
Premium Database Microsoft Access Data modeling
1 Chapter 1 Database Systems Database Systems: Design‚ Implementation‚ and Management‚ Seventh Edition‚ Rob and Coronel 1 1 In this chapter‚ you will learn: • The difference between data and information • What a database is‚ what the different types of databases are‚ and why they are valuable assets for decision making • The importance of database design • How modern databases evolved from file systems Database Systems: Design‚ Implementation‚ & Management‚ 7th Edition‚ Rob
Premium Database management system Database Data management
The entity-relationship model (or ER model) is a way of graphically representing the logical relationships of entities (or objects) in order to create a database. entity type is a collection of entity instances sharing similar properties Strong Entity Vs Weak Entity An entity set that does not have sufficient attributes to form a primary key is termed as a weak entity set. An entity set that has a primary key is termed as strong entity set. A weak entity is existence dependent. That is the
Premium Entity-relationship model Data modeling
Distributed Database Management Systems Rajat sharan errajatsharan@gmail.com Abstract: The dream of computing power as readily available as the electricity in a wall socket is coming closer to reality with the arrival of grid and cloud computing. At the same time‚ databases grow to sizes beyond what can be efficiently managed by single server systems. There is a need for efficient distributed database management systems (DBMSs). Current distributed DBMSs are not built to scale to more
Premium Database management system Client-server Database
of Database Systems ! Systems Concepts‚ 6th Edition‚ McGraw-Hill 2009. (The 4th and 5th editions are also OK to use.)! Will use slides from book as well as extra material! Posted on course page a day ahead of class! Database System Concepts - 6th Edition! Modified by T. Suel for CS6083‚ NYU Poly‚ Fall 2012! 1.1! ©Silberschatz‚ Korth and Sudarshan! CS6083: Principles of Database Systems ! Prerequisites: Data Structures‚ Operating Systems! Binary search trees‚ hash tables‚ sorting
Premium Database SQL Relational model
The construction of Object-Oriented Database Management Systems started in the middle 80 ’s‚ at a prototype building level‚ and at the beginning of the 90 ’s the first commercial systems appeared. The interest for the development of such systems stems from the need to cover the modeling deficiencies of their predecessors‚ that is the relational database management systems. They were intended to be used by applications that have to handle big and complex data such as Computer Aided Engineering‚ Computer
Premium Object-oriented programming Database Relational model
MODERN DATABASE MANAGEMENT - Database o An organized collection of logically related data. o May be any size and complexity. - Data o A stored representation of objects and events that have meaning and importance in the user’s environment. o Become useful when placed in some sort of context. o Structured • Facts such as the customer name‚ address‚ and telephone number. • The most important structured data types are numeric‚ character‚ and dates. • Stored in tabular form • Found
Premium Database Database model SQL
DataBase Concepts DataBase – a collection of information related to specific entity (e.g. organization‚ bank‚ college‚ library etc.) DBMS – (Database management system) – a application through which we can control the database i.e. we can store data into database‚ update the data and delete also we can retrieve the data from database. For doing these operation DBMS support a language called Structured Query language (SQL). SQL accomplishes many powerful tasks with a mere seven statements: SELECT
Premium SQL Database
FILE OPERATIONS File can be thought of as “logical” or a “physical” entity. File as a logical entity: a sequence of records. Records are either fixed size or variable size. A file as a physical entity: a sequence of fixed size blocks (on the disk)‚ but not necessarily physically contiguous (the blocks could be dispersed). Blocks in a file are either physically contiguous or not‚ but the following is generally simple to do (for the file system): »Find the first block »Find the last block »Find
Premium File system Computer file Database
Comparative study of DATA SECURITY IN some database MANAGEMENT SYSTEMS by JiaLiang Mao A Minor Thesis Submitted in partial fulfillment of the requirements for the degree of Master of Science in Computer Science Supervisor: Dr. Dat Dac Hoang Victoria University – Sydney City Centre (October‚ 2012) RCM6104‚RCM6105 Abstract Recently‚ database management systems (DBMSs) have become a main component of various kinds of dynamic web and applications. In these DBMSs‚ there
Premium Database management system Access control SQL