Current relational database software generally provides only a system catalog (and not a data dictionary).

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A system catalog is a collection of metadata about the database, including information about tables, columns, indexes, and users. A data dictionary is a more comprehensive collection of metadata that also includes information about the business rules and constraints that apply to the data. Relational database software generally provides only a system catalog, and not a data dictionary.

Current Relational Database Software Generally Provides Only a System Catalog