What is system catalog or catalog relation How is better known asDatabase Management System

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What is system catalog or catalog relation? How is better known as?Database-Management-System

What is system catalog or catalog relation? How is better known as?


By:13priya

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A DBMS needs to maintain a description of all the data items that it contains. Like a RDBMS contains information about all relation, databse objects, views and index present in it.
The DBMS should also maintains information about views (a definition of the view) to compute the tuples that belong in the view whenever the view is queried or called.
The multiple relations which stores information about data in database. Such tuples are created and maintained by the system itself. They are called as Catalog relations.
The catalog relations are also called the system catalog or the data dictionary.
The system catalog is sometimes also referred to as metadata (data about data).
The information in the system catalog is generally used only for query optimization.
It is better known as metadata.

prajwalamv

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