Tutorials ADO.NET Core Tutorial
Production Diagnostics — Complete Guide
Production Diagnostics — 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 80 of 100
Production Diagnostics
Foundations ✓ → SQL & safety ✓ → Production → Projects
Production · 3 — ASP.NET & enterprise · ~10 min · Module 8: Testing and Debugging
What is this?
Production diagnostics collect request id, command, Number, and server in structured logs — never passwords.
Why should you care?
ShopNest on-call needs enough context to act without SSHing blindly.
See it live — copy this example
Use a .NET console or API project with SQL Server LocalDB. Run dotnet run after pasting.
catch (SqlException ex) {
_logger.LogError(ex, "sql failed {Number} {Server} {Proc} {RequestId}",
ex.Number, ex.Server, cmd.CommandText, requestId);
throw;
}What happened?
- Correlation ids.
- Safe fields.
- Runbooks for common Numbers.
- Feature flags to add verbose SQL logging temporarily.
Practice next
- Standardize error log shape.
- Include RequestId.
- Runbook 4060/18456/1205.
- Sample successful slow queries.
- Attach Activity trace id.
Remember
Structured SqlException logs. Correlation. Runbooks.
ShopNest on-call SQL errors
Logs show Number+Proc+RequestId.
Outcome: MTTR drops.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
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