Tutorials ADO.NET Core Tutorial
Distributed Systems — Complete Guide
Distributed Systems — 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 66 of 100
Distributed Systems
Foundations ✓ → SQL & safety ✓ → Production → Projects
Production · 3 — ASP.NET & enterprise · ~10 min · Module 7: Advanced Enterprise Topics
What is this?
In distributed ShopNest, ADO.NET talks to owned SQL while other services communicate via HTTP/events — not shared DbConnections.
Why should you care?
Timeouts and idempotency matter more than clever SQL across services.
See it live — copy this example
Use a .NET console or API project with SQL Server LocalDB. Run dotnet run after pasting.
// OrderService: SqlTransaction local
// then publish order_placed (outbox)
// InventoryService: own SQL on messageWhat happened?
- Local ACID + messages.
- Idempotent consumers.
- No shared static SqlConnection across services.
Practice next
- Draw service+DB boxes.
- Outbox after local commit.
- Idempotent reserve.
- Add correlation id column.
- Retry policy on consumer.
Remember
Local SQL + messages. Idempotency. No shared connections.
ShopNest service boundaries
Each service owns SQL via ADO.NET.
Outcome: Failures stay isolated.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
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