What does query optimization involve?

Query optimization primarily involves analyzing and rewriting SQL queries to improve their performance. When a query is executed, it may not be the most efficient way to retrieve the required data, especially if it involves complex operations or large datasets. By optimizing the query, you can reduce the time it takes to execute and make better use of the database resources. This can include rearranging the order of operations, using appropriate indexing strategies, or even simplifying complex joins.

Query optimization does not focus on increasing data redundancy, converting queries into multiple data types, or directly enhancing end-user access—while these aspects may indirectly affect performance or usability, they are not the main focus of optimization efforts. The primary goal is to ensure that queries run faster and more efficiently, resulting in improved overall performance of the database system.