Tutorials ADO.NET Core Tutorial
Read Replica Strategies — Complete Guide
Read Replica Strategies — Complete Guide: free step-by-step lesson with examples, common mistakes, and interview tips — part of ADO.NET Core Tutorial on Toolliyo Academy.
On this page
ADO.NET Core Tutorial · Lesson 65 of 100
Read Replica Strategies
Foundations ✓ → SQL & safety ✓ → Production → Projects
Production · 3 — ASP.NET & enterprise · ~10 min · Module 7: Advanced Enterprise Topics
What is this?
Read replicas serve SELECTs while primary handles writes — ADO.NET picks connection string by operation.
Why should you care?
ShopNest scales reads without multiplying write contention.
See it live — copy this example
Use a .NET console or API project with SQL Server LocalDB. Run dotnet run after pasting.
string Cs(bool read) => read
? config.GetConnectionString("ShopNestDb_Read")!
: config.GetConnectionString("ShopNestDb")!;
await using var conn = new SqlConnection(Cs(readOnly));What happened?
- Accept lag.
- Don’t read-your-writes from replica for confirmation pages.
- Health-check both.
Practice next
- Add read CS.
- Route history to read.
- Keep place-order on primary.
- Sticky primary 5s after write.
- Fallback to primary on replica fail.
Remember
Write primary / read replica. Mind lag. Health both.
ShopNest read routing
History uses replica CS.
Outcome: Primary load drops.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
Sign in to ask a question or upvote helpful answers.
No questions yet — be the first to ask!
