Mehedi's Earth

When it comes to query performance tuning in SQL Server, key lookups are often the silent culprits that slow things down. This seemingly small operation can become expensive when repeated over thousands—or millions—of rows. In this article, we will break down what a key lookup is, why it happens, and how you can eliminate it with smarter indexing strategies. By addressing key lookups, you can significantly reduce I/O and boost query speed. So grab your execution plan and let’s uncover the hidden costs! [More]