What is SQL Server performance tuning?

SQL Server Performance Tuning refers to the process of optimizing the performance of SQL Server databases by identifying and resolving bottlenecks, improving query execution, and making efficient use of system resources. This involves analyzing queries, indexes, server configurations, and hardware to enhance speed and responsiveness. Performance tuning can include rewriting queries, updating statistics, adding or modifying indexes, and adjusting server settings. The goal is to ensure that SQL Server runs efficiently, minimizing response time and maximizing throughput for users and applications.