Description: Performance overhead in the context of SQL query optimization refers to the additional resources required to execute a query, which can negatively impact the overall performance of a database. This phenomenon occurs when a query is not optimized, resulting in excessive use of CPU, memory, and increased response time. Overhead can be caused by various factors, such as the lack of proper indexing, inefficient database design, or the execution of complex operations that require intensive processing. As databases grow in size and complexity, performance overhead becomes a critical challenge for database administrators and developers, who must ensure that queries run efficiently to maintain optimal performance. Identifying and mitigating this overhead is essential to ensure that applications relying on the database operate smoothly and quickly, which in turn enhances the end-user experience and overall operational efficiency.
