ORACLE 12C: SQL
ORACLE 12C: SQL
17th Edition
ISBN: 9781305449947
Author: CASTEEL
Publisher: CENGAGE L
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Chapter 2, Problem 1RQ

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Data dictionary:

Data dictionary is referred as the components of Database Management System (DBMS) that store the data features and associations. It also refers the data about data.

  • It offers the DBMS with features of self-describing.
  • It resembles x-ray of company’s complete data set and it is vital component in data administration.
  • There are two main types of data dictionaries. They are as follows:
    • Integrated data dictionary
    • Standalone data dictionary
  • The functions of data dictionary in the database design are listed below:
    • The contents of data dictionary are used for verifying the components of database design such as entities, attributes and relationships that exists between them.
    • Database design is used by the designer to check for their homonyms and synonyms.
    • It also verifies the entities and attributes created can be able to support all the queries in required way along with report requirements.

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ORACLE 12C: SQL

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