Tutorials ADO.NET Core Tutorial
Multi-Database Architecture — Complete Guide
Multi-Database Architecture — 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 64 of 100
Multi-Database Architecture
Foundations ✓ → SQL & safety ✓ → Production → Projects
Production · 3 — ASP.NET & enterprise · ~10 min · Module 7: Advanced Enterprise Topics
What is this?
Multiple databases separate concerns (OrdersDb, CatalogDb) with separate connection strings and repos.
Why should you care?
ShopNest services own data — no cross-db joins in app code casually.
See it live — copy this example
Use a .NET console or API project with SQL Server LocalDB. Run dotnet run after pasting.
services.AddScoped<IOrderRepository, OrderRepository>(); // Orders CS
services.AddScoped<ICatalogRepository, CatalogRepository>(); // Catalog CSWhat happened?
- One repo per database.
- Integrate via APIs/events.
- Distributed tx avoided.
Practice next
- Two connection strings.
- Two repos.
- No cross-db SQL.
- Read product name via catalog API.
- Outbox for sync.
Remember
CS per database. Repo per store. Integrate explicitly.
ShopNest split stores
Orders and Catalog DBs separate.
Outcome: Teams deploy schemas independently.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
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