Chapter 23: Problem 3

How is the view mechanism used as an authorization mechanism?

Short Answer

Expert verified

The view mechanism offers an additional layer of authority on top of the usual database access controls. By creating a view on the table and providing access to users on the view rather than the table, we can limit what the user can see. Permissions can be granted on views, providing control over what data can be viewed, inserted, updated or deleted. This ensures the base tables remain protected and with granular control.

Step by step solution

Understanding the View Mechanism

The view mechanism in a database is essentially a stored query or a virtual table, which is based on the result-set of an SQL statement. It consists of rows and columns, just like any actual table. The fields in a view are the columns from one or more tables in the database. As a virtual table, a view does not physically exist. It is a set of references to data from other tables.

Understanding Authentication and Authorization

Authentication is the process of identifying an individual, usually based on a username and password. Authorization happens after successful authentication; it is the process of granting or denying access rights to database resources.

Usage of Views for Authorization

Views can restrict the user’s access to the data because the view can include specific columns from the table. The users can only view the specified columns not the entire table. Moreover, restrictions can be added on the rows from the base table that can appear in the View, thereby ensuring more grained control. This way, views serve as an authorization mechanism in databases. We can grant permissions, like SELECT, INSERT, UPDATE, DELETE, on Views, while keeping the base tables protected.

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How is the view mechanism used as an authorization mechanism?

Short Answer

Step by step solution

Understanding the View Mechanism

Understanding Authentication and Authorization

Usage of Views for Authorization

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