In a database, information system, or as a component of a research project, data elements are used or recorded. A data dictionary is a collection of names, definitions, and attributes about those data elements.
What is Data Dictionary?
The catalog makes its contents available to users and DBAs, but it is primarily used by the DBMS's various software modules, including the DDL and DML compilers, the query optimizer, the transaction processor, the report generators, and the constraint enforcer.
A data dictionary, on the other hand, is a type of data structure used to store metadata, or (structured) data about information. The software package for a standalone data dictionary or data repository may interact with the software modules of the DBMS, but its primary users for information resource management are computer system designers, users, and administrators. These systems preserve data on the configuration of system hardware and software, documentation, applications, users, and other data pertinent to system administration.
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