Handling Multiple Concurrent Requests in ASP.NET Core with Entity Framework - Deadlock Issues
I've encountered a strange issue with I'm converting an old project and I'm working on an ASP.NET Core 6 application that uses Entity Framework Core 6 for data access. I've encountered an scenario where multiple concurrent requests lead to deadlocks when trying to update the same records. Specifically, when two users try to update the same entity, I get a `DbUpdateConcurrencyException` along with SQL behavior `1205 - Transaction (Process ID) was deadlocked on lock resources with another process and has been chosen as the deadlock victim.` I've tried implementing optimistic concurrency by adding a `RowVersion` column to my entity, but I still experience issues under load. Here’s an example of my entity configuration: ```csharp public class Product { public int Id { get; set; } public string Name { get; set; } public decimal Price { get; set; } [Timestamp] public byte[] RowVersion { get; set; } } ``` In the `DbContext`, I am overriding `SaveChangesAsync` to catch the concurrency exception and retry the operation: ```csharp public async Task<int> SaveChangesWithRetryAsync() { int retryCount = 0; while (true) { try { return await SaveChangesAsync(); } catch (DbUpdateConcurrencyException ex) { if (retryCount >= 3) { throw; } retryCount++; // Log exception and retry } } } ``` Despite this approach, I still encounter deadlocks under high load. I've also tried reducing transaction isolation levels and using `AsNoTracking()` for read operations without success. Is there a better way to handle concurrent updates in EF Core, or any best practices to avoid deadlocks in this scenario? Any guidance or insights would be greatly appreciated. My development environment is Ubuntu. Am I missing something obvious? I'm working on a application that needs to handle this. Has anyone else encountered this?