MCQ IN COMPUTER SCIENCE & ENGINEERING

Detailed explanation-1: -So, storing the relational schemas and other metadata about the relations in a structure is known as Data Dictionary or System Catalog. A data dictionary is like the A-Z dictionary of the relational database system holding all information of each relation in the database.

Detailed explanation-2: -All the data dictionary tables and views for a given database are stored in that database’s SYSTEM tablespace. Not only is the data dictionary central to every Oracle database, it is an important tool for all users, from end users to application designers and database administrators.

Detailed explanation-3: -Data Dictionary in DBMS provides additional information about relationships between multiple database tables, helps to organize data, and prevents data redundancy in DBMS. A data dictionary is a set of files that contain a database’s metadata. Thus, it is also known as a metadata repository.

Detailed explanation-4: -A Data Dictionary Definition A Data Dictionary is a collection of names, definitions, and attributes about data elements that are being used or captured in a database, information system, or part of a research project.

Detailed explanation-5: -Data dictionary contents can vary but typically include some or all of the following: A listing of data objects (names and definitions) Detailed properties of data elements (data type, size, nullability, optionality, indexes) Entity-relationship (ER) and other system-level diagrams.