Maximizing Query Performance: Choosing the Right Time to Use Views in Database Development

When to Use Views:

Simplifying complex queries: Views can be used to simplify complex queries by breaking them down into smaller, more manageable parts. For example, if you have a query that joins several tables together, you can create a view that encapsulates the join logic, making it easier to write queries against that data.

Data Security: Views can be used to restrict access to sensitive data by providing a simplified interface to the underlying data. For example, you can create a view that only exposes certain columns or rows to specific users or groups.

Performance: Views can be used to improve performance by reducing the amount of redundant code in queries. For example, if you have a query that joins several tables together and includes multiple aggregate functions, you can create a view that encapsulates that logic, allowing you to reuse it across multiple queries without duplicating code.

When Not to Use Views:

Complex Views: Creating views with complex logic can negatively impact query performance. Views that include subqueries or aggregate functions can be particularly problematic. In these cases, it may be better to use stored procedures or functions instead.

Performance Issues: Views can negatively impact performance if they are not properly optimized. For example, views that join multiple tables can cause performance issues if the underlying tables are large or poorly indexed. In these cases, it may be better to use indexed views or materialized views.

Data Modification: Views that are used for data modification (i.e., inserting, updating, or deleting data) can be problematic because they can introduce inconsistencies and make it difficult to maintain data integrity. In these cases, it may be better to use stored procedures or functions instead.

In conclusion, views can be a powerful tool for simplifying complex queries and improving performance, but they should be used judiciously and with care to avoid introducing performance and maintenance issues. ... https://www.youtube.com/watch?v=RBx8sSC0-jo