DataContext SaveChangesAsync Deadlocks in .NET 5 with Entity Framework Core and Long-Running Transactions
I'm deploying to production and I am currently working with a deadlock scenario when trying to save changes in my .NET 5 application using Entity Framework Core... My application has multiple concurrent transactions that interact with the same set of records, and I noticed that under heavy load, the `SaveChangesAsync` method often hangs, leading to a timeout exception. The behavior message I'm receiving is: ``` System.Data.Entity.Infrastructure.DbUpdateConcurrencyException: The operation failed due to a concurrency violation. ``` I’ve tried implementing optimistic concurrency by adding a `RowVersion` column to my model. Here’s a simplified version of my entity: ```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; } } ``` Additionally, I am using the following configuration in my `DbContext`: ```csharp protected override void OnModelCreating(ModelBuilder modelBuilder) { modelBuilder.Entity<Product>().Property(p => p.RowVersion).IsRowVersion(); } ``` I also tried wrapping the `SaveChangesAsync` calls in a `try-catch` block to handle any potential exceptions, but the hangs still occur intermittently. I am using an SQL Server database, and I’ve noticed that the deadlocks seem to occur more frequently when multiple users are trying to update the same product record at the same time. I’ve been looking into using transactions with a higher isolation level, but I'm concerned that this could lead to performance optimization elsewhere. Could anyone provide insights on how to debug this deadlock scenario or suggest best practices for managing concurrency in Entity Framework Core? Any guidance on logging deadlock occurrences would also be appreciated. Any ideas how to fix this?