Tutorials ADO.NET Core Tutorial
Monitoring SQL Performance — Complete Guide
Monitoring SQL Performance — 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 79 of 100
Monitoring SQL Performance
Foundations ✓ → SQL & safety ✓ → Production → Projects
Production · 3 — ASP.NET & enterprise · ~10 min · Module 8: Testing and Debugging
What is this?
Monitor SQL with DMVs/Query Store plus app metrics for ADO.NET call rates and failures.
Why should you care?
ShopNest SRE needs SQL health next to API SLOs.
See it live — copy this example
Use a .NET console or API project with SQL Server LocalDB. Run dotnet run after pasting.
// app: requests/sec, error rate, p95 per command name
// SQL: Query Store top duration, waits
_metrics.Increment("sql.errors", ("number", ex.Number));What happened?
- Golden signals for SQL.
- Alert on error spikes and duration regressions.
- Map Number to playbooks.
Practice next
- Export metrics per proc.
- Alert on 1205/timeouts.
- Watch Query Store regressions.
- Dashboard for pool exhaustion.
- SLA burn for checkout SQL.
Remember
App + SQL signals. Alert errors/duration. Playbooks by Number.
ShopNest SQL SLO board
p95 and errors per usp_ visible.
Outcome: Regressions caught before customers.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
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