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A data dictionary is (generally) a read-only set of tables and views that holds metadata - used in a database management system. The data dictionary may be considered a database in its own right. Amongst other things, a Data Dictionary holds the following information: *Usernames, Roles and Privileges *Schema Objects *Integrity Constraints *Stored procedures and Triggers *General Database Structure *Audit information *Space allocations One benefit of a well prepared data dictionary is a consistency between data items across different tables.
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