SQL Server: How to Handle Deadlock Situations When Using Transaction with READPAST Locking
Quick question that's been bugging me - I'm experimenting with I'm working with deadlock situations in SQL Server 2019 when two transactions try to read from the same table but are also attempting to update a different resource simultaneously. I have implemented `READPAST` locking to avoid blocking reads, but it seems that it's not sufficient in this case. Here’s a simplified version of what I'm doing: ```sql BEGIN TRANSACTION; SELECT * FROM Orders WITH (READPAST) WHERE Status = 'Pending'; UPDATE Orders SET Status = 'Processing' WHERE OrderID = @OrderID; COMMIT; ``` When two transactions run this simultaneously, I receive the behavior message: ``` Transaction (Process ID 123) was deadlocked on lock resources with another process and has been chosen as the deadlock victim. ``` I've tried increasing the transaction timeout settings and also using `NOLOCK`, but it didn't help with the deadlocks. Another approach I considered was to implement a retry logic for the transactions, but I'm not sure the best way to do that while ensuring data integrity. Is there a better way to handle this deadlock scenario while still allowing for concurrent reads and updates, or should I rethink the transaction isolation level altogether? Any guidance or best practices would be greatly appreciated. I'm using Sql 3.10 in this project. I'm open to any suggestions. My development environment is macOS. What are your experiences with this?