A Data Dictionary is a collection of descriptions of the data objects or items in a data model for the benefit of programmers and others who need to refer to them. In database management systems, Data Dictionary is a file that defines the basic organization of a database. A data dictionary contains a list of all files in the database, the number of records in each file, and the names and types of each field. Most database management systems keep the data dictionary hidden from users to prevent them from accidentally destroying its contents.
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