Free diagnostic · runs in your browser
Blocking-chain explainer
Paste a live blocking snapshot. See the head blocker and who waits on whom — with waits, logins, and a SQL snippet. Point-in-time only. No email. Nothing uploaded.
1. Run this read-only query
Needs
VIEW SERVER STATE
(≤2019) or
VIEW SERVER PERFORMANCE STATE
(2022+). Capture while blocking is active. SSMS: Copy with Headers → paste below.
Diagnostic aid only — point-in-time snapshot. Idle lock holders may not appear if they have no request row. Processed entirely in your browser; nothing is uploaded.