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- W156948967 abstract "This chapter presents a detailed analysis of the functions of a database management system (DBMS) that shows that three levels of data view can usefully be distinguished. The chapter defines “schema” as a data view that is specified in a language that the DBMS software is designed to understand. The chapter explains the three schemas: conceptual, internal, and external. The conceptual schema is a description of all the data of interest to the enterprise that is to be stored in the database. The conceptual schema specifies the logical data content of the database and the constraints that apply to the data. The external schema describes the local view of the database required by an application program. The internal schema describes how the stored data is implemented at the level of stored records and formats, indexes, hashing algorithms, pointers, block sizes, storage media, and the likes. With the help of a diagram, the chapter also explains the three-level architecture. The chapter points out that the three-level architecture provides a higher level of program/data independence. The three-level architecture proposed for the DBMS suggests that the three schemas are divided among three administrators. The conceptual schema is administered by the enterprise administrator, the external schema is administered by the application administrator, and the internal schema is by the database administrator." @default.
- W156948967 created "2016-06-24" @default.
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- W156948967 date "2001-01-01" @default.
- W156948967 modified "2023-09-27" @default.
- W156948967 title "Database management system architecture" @default.
- W156948967 doi "https://doi.org/10.1016/b978-075065086-1/50003-4" @default.
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