TempDB Spill: The Silent Server Killer
Perfect index. Solid execution plan. You’ve reviewed the query line by line. And yet, sometimes everything crashes. If all basic metrics look normal… no CPU spikes, no memory pressure, no network bottleneck. You may be a spill-to-TempDB victim. Ok, but what is a TempDB spill? Some SQL Server operations, like Sort (especially with geospatial queries - my experience) and Hash Match, require memory. Before running a query, SQL Server estimates how much memory it needs. ...