Question

describe the importance of a data dictionary for a research project involving patients with a diagnosis such as CHF

Answer 1

Ans) A data dictionary contains metadata i.e data about the database. The data dictionary is very important as it contains information such as what is in the database, who is allowed to access it, where is the database physically stored etc. Physical information about the tables such as where they are stored and how.

- It is a set of information describing the contents, format, and structure of a database and the relationship between its elements, used to control access to and manipulation of the database.

- The main functions of data dictionaries are. It defines the data objects of each user in the database. By this way, it helps various users to know all the objects which exist in the database and who can access it. One cannot remember all the tables, views constraints etc in a huge database.