SQL Server 2016: Issue with Transaction Isolation Levels Causing Deadlocks in High-Concurrency Environment
I'm encountering a deadlock issue in SQL Server 2016 when multiple sessions are trying to update records in a high-concurrency environment. Both sessions are using the `SERIALIZABLE` isolation level, and I've noticed that the deadlock graph often shows a pattern where Session A holds a lock on Row 1 and waits for Row 2, while Session B holds a lock on Row 2 and waits for Row 1. I've tried switching to `READ COMMITTED` and `SNAPSHOT` isolation levels to see if that helps, but the issue persists. Here's a simplified version of the code that I'm using: ```sql BEGIN TRANSACTION; UPDATE dbo.MyTable SET Column1 = 'Value' WHERE Id = @Id1; WAITFOR DELAY '00:00:01'; UPDATE dbo.MyTable SET Column1 = 'Value' WHERE Id = @Id2; COMMIT; ``` In my tests, I have two different sessions running this code with parameters that target overlapping records. I'm using a standard connection string with default settings, and I'm trying to determine if I should implement some form of retry logic or if there's a better way to handle this without running into deadlocks. I've also reviewed the execution plans and indexed the columns involved in the updates, but it doesn't seem to alleviate the deadlocks. Any advice on how to handle this situation more effectively would be greatly appreciated!