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Qu'est-ce (qui) est data dictionary - définition
Data dictionary
SET OF METADATA THAT CONTAINS DEFINITIONS AND REPRESENTATIONS OF DATA ELEMENTS
Data Dictionary; Data Dictionaries; Data Description Specifications; Data element dictionary; Data description specification
A data dictionary, or metadata repository, as defined in the IBM Dictionary of Computing, is a "centralized repository of information about data such as meaning, relationships to other data, origin, usage, and format".ACM, IBM Dictionary of Computing, 10th edition, 1993 Oracle defines it as a collection of tables with metadata.
data dictionary
SET OF METADATA THAT CONTAINS DEFINITIONS AND REPRESENTATIONS OF DATA ELEMENTS
Data Dictionary; Data Dictionaries; Data Description Specifications; Data element dictionary; Data description specification
<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 {system
catalog}. The data dictionary is a more general software
utility used by designers, users, and administrators for
information resource management.
The data dictionary may maintain information on system
hardware, software, documentation, users, and other aspects.
Data dictionaries are also used to document the database
design process itself and can accumulate meta-data
ready to feed into the system catalog.
[Does anybody call them "codebooks"? ]
(2001-04-24)
IEC Common Data Dictionary
A COMMON REPOSITORY OF CONCEPTS FOR ALL INDUSTRIAL/TECHNICAL DOMAINS
Draft:IEC Common Data Dictionary
IEC Common Data Dictionary (abbreviated: IEC CDD) is a metadata registry providing product classification and formalized product descriptions that can be used in context of smart manufacturing and Industrie 4.0.
