Category: Performance and Query Health

DBA scripts for diagnosing waits, blocking, and performance bottlenecks.

  • Script: I/O Usage by Database

    This script returns total read and write activity per database based on file-level I/O statistics. It helps identify which databases are generating the most disk activity on the instance. This is commonly used during performance troubleshooting, storage pressure investigations, and workload analysis. The Script Example Output The result set shows one row per database, including…

  • Script: Check Worker Threads and Active Sessions

    This script shows the current SQL Server worker thread count along with all active sessions and requests. It provides a live view of CPU usage, blocking, waits, running commands, and transaction activity. This is a practical script for performance troubleshooting when an instance appears busy, unresponsive, or under pressure. The Script Example Output The first…

  • Script: Top Wait Statistics

    This script returns the top wait types since the last SQL Server restart or wait statistics clear, excluding common idle and background waits. It provides a quick high-level view of where the instance is spending time. This is often the first script run during performance investigations to identify whether the primary pressure is related to…