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Computing (FOLDOC) dictionary
data dictionary
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database A data structure that stores meta-data, i.e. data
about data. The term "data dictionary" has several uses.
Most generally it is a set of data descriptions that
can be shared by several applications.
Usually it means a table in a database that stores the
names, field types, length, and other characteristics of
the fields in the database tables.
An active data dictionary is automatically updated as changes
occur in the database. A passive data dictionary must be
manually updated.
In a DBMS, this functionality is performed by the systemcatalog. The data dictionary is a more general software
utility used by designers, users, and administrators for
The data dictionary may maintain information on system
hardware, software, documentation, users, and other aspects.