Tutorials ADO.NET Core Tutorial
Performance Profiling — Complete Guide
Performance Profiling — 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 76 of 100
Performance Profiling
Foundations ✓ → SQL & safety ✓ → Production → Projects
Production · 3 — ASP.NET & enterprise · ~10 min · Module 8: Testing and Debugging
What is this?
Profile end-to-end: API latency + ADO.NET command timings + SQL wait stats.
Why should you care?
ShopNest “slow checkout” needs evidence, not guesses.
See it live — copy this example
Use a .NET console or API project with SQL Server LocalDB. Run dotnet run after pasting.
var sw = Stopwatch.StartNew();
await cmd.ExecuteNonQueryAsync(ct);
Activity.Current?.SetTag("db.duration_ms", sw.ElapsedMilliseconds);
_metrics.RecordSql("usp_Orders_Place", sw.ElapsedMilliseconds);What happened?
- OpenTelemetry/App Insights tags.
- Compare p95 API vs SQL.
- Fix the larger slice first.
Practice next
- Add duration metric per proc.
- Dashboard p95.
- Correlate with Query Store.
- Alert if usp_Orders_Place > 200ms p95.
- Add rows-affected tag.
Remember
Measure API+SQL. Tag durations. Fix top waiters.
ShopNest checkout profile
db.duration_ms shows place-order cost.
Outcome: Team targets the real bottleneck.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
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