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<h2 class="titre">The databases</h2> <p>A database is an application that manages data and allows for rapid storage and retrieval of this data. A database management system (DBMS) is a set of programs that allows you to store, modify and extract information from a database, it also provides users with tools to add, delete, open, modify and analyze data stored in a single location. Many applications use the DBMS such as inventory inventory software, software for ATMs, reservation software.</p> <p>A database can be used in multiple ways to ensure data integrity and consistency. The main functions in the DBMS are as follows: develop a data dictionary, store data, update data, manage data security, control multi-user access, backup and recoveryreroute lost data, maintain data integrity, develop database access codes, analyze data, be a communication interface, and manage all transactions.</p> <p>Databases can be classified in various ways. The number of users can be defined as a criterion. If the database is installed on a personal computer, for a single use, it is called a desktop database. A database d´entreprise is at the service of about a hundred users. Another classification criterion is based on the actual use of the database. Operational databases provide effective support to users for their daily activities: purchases, sales, payments, etc. This type of software must demonstrate a very fast data processing capacity and a possibility of simultaneous processing of operations. Analytical databases provide statistics and forecasts. The data will be used to conduct temporal analyses of all kinds of statistics.</p> <p>Depending on the multiple uses assigned to them, dozens of database software packages are available on the market. The most popular are Oracle, FileMaker Pro, Avanquest, Sybase, FoxPro, IBM DB2, Linter, Microsoft Access, Microsoft SQL Server, MySQL, PostgreSQL and SQLite.</p> <p></p>