The server room at OmniLogistics felt more like a sauna than a data center. Inside, Sarah sat hunched over her monitor, bathed in the frantic amber glow of "High CPU" alerts.
The CPU line on the monitor, which had been a flat ceiling at 99%, plummeted to a cool 12%. The report that had timed out after ten minutes now populated in four seconds. SQL Server Query Performance Tuning, 4th Edition
Using the book’s breakdown of , she realized the optimizer was choosing a massive Clustered Index Scan instead of a Seek. It was trying to read the entire history of the company just to find today's shipping manifests. The server room at OmniLogistics felt more like