When you need to diagnose SQL Server performance problems, without a structured approach, it’s easy to chase the obvious symptoms and miss the underlying causes. A slow query might point to a missing index, a misconfigured server setting, or a maintenance task that’s been skipped for months. Often, it’s more than one thing.
To help give you a clear picture of where the gaps are and what to tackle first, we’ve created a handy MS SQL Server performance checklist for you to download.
What to check (and why it matters)
There are five areas worth working through on any SQL Server: index health, query performance, server configuration, storage and I/O, and ongoing maintenance.
Index problems are one of the most common causes of poor performance. Missing indexes force SQL Server to scan entire tables instead of jumping straight to the data it needs. Unused indexes, on the other hand, slow down every write operation without providing any benefit. Both are easy to overlook, and both show up regularly in SQL Servers that haven’t had a recent review.
Server configuration is another area where the defaults tend to cause problems. Settings like Max Server Memory and Cost Threshold for Parallelism are rarely configured correctly out of the box, and getting them wrong can affect every query running on the server.
Beyond that, it’s worth checking that alerting is in place, that backups are actually restorable, and that there’s a performance baseline recorded somewhere. Without a baseline, it’s very difficult to tell whether performance has degraded, or by how much.
MS SQL Server performance checklist
We’ve put together a SQL Server Performance Checklist covering checks across all five areas, with guidance on what to look for, why it matters, and which items to prioritise first.
It’s free to download and is designed to be practical rather than exhaustive. Whether you’re doing a one-off review or building it into a regular routine, it gives you a structured starting point.
