What is the difference between a database index and a database view, and when would you use each one in a database design?

Difference Between Database Index and Database View

A database index is a data structure that improves the speed of data retrieval operations on a database table by providing quick access to specific rows. It is used to enhance the performance of queries by allowing them to quickly locate and retrieve data based on specific columns.

On the other hand, a database view is a virtual table that is based on the result set of a SQL query. It does not store data itself but instead displays data from one or more underlying tables. Views can be used to simplify complex queries, provide a layer of abstraction, and enhance security by controlling access to specific data.

When to Use Database Index:

• Use database indexes when you need to improve the performance of data retrieval operations, especially for frequently accessed columns.
• Indexes are ideal for speeding up queries that involve filtering, sorting, or joining tables.
• Consider using indexes on columns that are used in the WHERE, JOIN, ORDER BY, or GROUP BY clauses of queries.

When to Use Database View:

• Use database views to simplify complex queries and encapsulate logic for data retrieval.
• Views are helpful for presenting data in a pre-defined format without modifying the underlying tables.
• Consider using views to restrict access to certain columns or rows of a table based on user permissions.

In conclusion, database indexes are used to improve query performance, while database views are used for data abstraction and simplification. Understanding the differences between indexes and views and their respective use cases is essential in designing an efficient and scalable database system.