SQL Server: Deadlock issues when using nested transactions and SAVEPOINT
I've been working on this all day and I've searched everywhere and can't find a clear answer... Hey everyone, I'm running into an issue that's driving me crazy... I'm refactoring my project and I've tried everything I can think of but I'm sure I'm missing something obvious here, but I'm working with deadlock issues in SQL Server 2019 when I use nested transactions with SAVEPOINT commands. My application logic involves multiple operations where I need to roll back to a specific point in the transaction if a validation fails. However, this is leading to frequent deadlocks, especially under heavy load. Here's a simplified version of my transaction logic: ```sql BEGIN TRANSACTION; SAVE TRANSACTION SavePoint1; INSERT INTO Orders (OrderID, CustomerID) VALUES (1, 'C001'); -- Some logic that might unexpected result IF (some_validation_fails) BEGIN ROLLBACK TRANSACTION SavePoint1; -- This causes deadlock sometimes END ELSE BEGIN COMMIT TRANSACTION; END END ``` In a high-concurrency environment, I’m seeing deadlock errors like: ``` Transaction (Process ID XX) was deadlocked on lock resources with another process and has been chosen as the deadlock victim. Rerun the transaction. ``` I’ve tried using the `WITH (UPDLOCK, ROWLOCK)` hints to manage locks better on certain queries, but it hasn't resolved the deadlock scenario. I also considered adjusting the isolation level to `READ COMMITTED SNAPSHOT`, but I’m worried about the implications that could have on my data consistency. Is there a better way to manage these nested transactions, or perhaps a different approach to handling rollbacks that would help avoid deadlocks in SQL Server? For reference, this is a production mobile app. Is there a better approach? Is this even possible? What's the correct way to implement this? I'd really appreciate any guidance on this. The stack includes Sql and several other technologies. Am I approaching this the right way? My development environment is Ubuntu 22.04.