Database systems introduction to databases and data warehouses pdf download


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For the computer program, see Europress. For a topical guide to this subject, see Outline of databases.

An example of output from an SQL database query. A database is an organized collection of data.

A relational database, more restrictively, is a collection of schemas, tables, queries, reports, views, and other elements. A general-purpose DBMS allows the definition, creation, querying, update, and administration of databases.

A database is not generally portable across different DBMSs, but different DBMSs can interoperate by using standards such as SQL and ODBC or JDBC to allow a single application to work with more than one DBMS. 1980s have all supported the relational model – generally associated with the SQL language. Sometimes a DBMS is loosely referred to as a “database”. Formally, a “database” refers to a set of related data and the way it is organized.

The DBMS provides various functions that allow entry, storage and retrieval of large quantities of information and provides ways to manage how that information is organized. Because of the close relationship between them, the term “database” is often used casually to refer to both a database and the DBMS used to manipulate it. This article is concerned only with databases where the size and usage requirements necessitate use of a database management system.

Creation, modification and removal of definitions that define the organization of the data. Insertion, modification, and deletion of the actual data. Providing information in a form directly usable or for further processing by other applications.

The retrieved data may be made available in a form basically the same as it is stored in the database or in a new form obtained by altering or combining existing data from the database. Registering and monitoring users, enforcing data security, monitoring performance, maintaining data integrity, dealing with concurrency control, and recovering information that has been corrupted by some event such as an unexpected system failure.