Tutorials ADO.NET Core Tutorial
API Optimization — Complete Guide
API Optimization — 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 60 of 100
API Optimization
Foundations ✓ → SQL & safety ✓ → Production → Projects
Production · 3 — ASP.NET & enterprise · ~10 min · Module 6: ASP.NET Core Integration
What is this?
Optimize ADO.NET APIs with single queries, DTO projection, caching safe GETs, and connection reuse via pooling.
Why should you care?
ShopNest mobile home must not fire 15 SQL calls.
See it live — copy this example
Use a .NET console or API project with SQL Server LocalDB. Run dotnet run after pasting.
// one query joins needed fields instead of N+1
cmd.CommandText = @"SELECT o.Id, o.Total, c.Name
FROM Orders o JOIN Customers c ON c.Id=o.CustomerId
WHERE o.Id=@Id";What happened?
- Kill N+1.
- Cache product cards.
- Keep commands async.
- Measure.
Practice next
- Find N+1 in a screen.
- Replace with join/IN.
- Cache GET product.
- IN clause with TVP for many ids.
- ETag for product card.
Remember
Fewer round trips. Project DTOs. Cache safe reads.
ShopNest home SQL trim
Aggregated query replaces N+1.
Outcome: Home p95 improves.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
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