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Access to this data is usually provided by a "database management system" (DBMS) consisting of an integrated set of computer software that allows users to interact with one or more databases and provides access to all of the data contained in the database (although restrictions may exist that limit access to particular data).

The biggest academic database & search engine (over 390 million records, unofficial estimate) Contains over 2,500 journals (including 700 journals from Poland ). Provides free public access to over 266,000 full-text documents and bibliographic citations of Department of Energy ( DOE) research report literature.

Main article: Relational model This model organizes data into one or more tables(or "relations") of columnsand rows, with a unique key identifying each row. Rows are also called recordsor tuples.[11] Columns are also called attributes. Generally, each table/relation represents one "entity type" (such as customer or product).

From Wikipedia, the free encyclopedia A data access layer ( DAL) in computer software is a layer of a computer program which provides simplified access to data stored in persistent storage of some kind, such as an entity-relational database. This acronym is prevalently used in Microsoft environments.