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Database Systems – Set Theory
Database Systems – Set Theory

... Most data is gathered in a fragmented manner from many sources (both internal and external). Additionally, most systems are designed for transactional purposes, which doesn’t lend itself to information gathering. Think about how limits of the operation of an ATM machine. ...
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... information on the World Wide Web. As XML becomes widely accepted, the need for systematic and efficient storage of XML documents arises. Many alternatives to manage XML document collections exist. Several approaches based on traditional database management systems, such as storing XML in relational ...
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Slide 1

... They are specially designed software applications that interact with the user, other applications, and the database itself to capture and analyse data. • A general-purpose DBMS is a software system designed to allow the definition, creation, querying, update, and administration of databases. Data Mo ...
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... or object-relational databases. These systems fall usually into the Online Transactional Processing (OLTP) category, using the Entity/Relationship (ER) model mapped into database tables. They are used in general to store and retrieve individual patient records for healthcare purposes. In this scenar ...
Transaction Management - USA School of Computing
Transaction Management - USA School of Computing

... Atomic – All or Nothing All parts of the transaction must be completed and committed or it must be aborted and rolled back Consistent Each user is responsible to ensure that their transaction (if executed by itself) would leave the database in a consistent state ...
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Distributed Database - delab-auth
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Database

A database is an organized collection of data. It is the collection of schemes, tables, queries, reports, views and other objects.The data is typically organized to model aspects of reality in a way that supports processes requiring information, such as modelling the availability of rooms in hotels in a way that supports finding a hotel with vacancies.A database management system (DBMS) is a computer software application that interacts with the user, other applications, and the database itself to capture and analyze data. A general-purpose DBMS is designed to allow the definition, creation, querying, update, and administration of databases. Well-known DBMSs include MySQL, PostgreSQL, Microsoft SQL Server, Oracle, Sybase and IBM DB2. A database is not generally portable across different DBMSs, but different DBMS can interoperate by using standards such as SQL and ODBC or JDBC to allow a single application to work with more than one DBMS. Database management systems are often classified according to the database model that they support; the most popular database systems since the 1980s have all supported the relational model as represented by the SQL language. Sometimes a DBMS is loosely referred to as a 'database'.
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