Tutorials ADO.NET Core Tutorial
Deadlock Analysis — Complete Guide
Deadlock Analysis — Complete Guide: free step-by-step lesson with examples, common mistakes, and interview tips — part of ADO.NET Core Tutorial on Toolliyo Academy.
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ADO.NET Core Tutorial · Lesson 78 of 100
Deadlock Analysis
Foundations ✓ → SQL & safety ✓ → Production → Projects
Production · 3 — ASP.NET & enterprise · ~10 min · Module 8: Testing and Debugging
What is this?
Analyze deadlocks via XEvents/graph XML and fix lock order or isolation in ADO.NET callers.
Why should you care?
ShopNest inventory+order updates deadlock under flash sales.
See it live — copy this example
Use a .NET console or API project with SQL Server LocalDB. Run dotnet run after pasting.
// capture deadlock graph → victim was usp_Inventory_Reserve
// fix: always lock Order then Inventory in same order
cmd.CommandText = "usp_Orders_PlaceWithReserve"; // single proc, ordered locksWhat happened?
- Consistent lock order.
- Shorter transactions.
- Retry 1205.
- Prefer one proc that locks predictably.
Practice next
- Enable deadlock XEvent.
- Reproduce two sessions.
- Read graph.
- Add UPDLOCK hint intentionally in proc.
- Metric deadlock count.
Remember
Read deadlock graph. Order locks. Retry 1205.
ShopNest flash-sale deadlocks
Ordered locks + retry cut errors.
Outcome: Checkout survives peak.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
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