SQL Server Deadlock guide with Nested Stored Procedures and Transactions
I've been banging my head against this for hours. I've looked through the documentation and I'm still confused about Hey everyone, I'm running into an issue that's driving me crazy. I'm working with a deadlock situation in SQL Server 2019 when executing nested stored procedures that involve transactions. The main stored procedure, `ProcessOrder`, calls another stored procedure, `UpdateInventory`, which is supposed to update stock levels. Here is a simplified version of the main stored procedure: ```sql CREATE PROCEDURE ProcessOrder @OrderID INT AS BEGIN BEGIN TRANSACTION; TRY -- Some order processing logic here EXEC UpdateInventory @OrderID; -- More processing logic COMMIT TRANSACTION; END TRY BEGIN CATCH ROLLBACK TRANSACTION; -- behavior handling logic END CATCH END ``` The `UpdateInventory` stored procedure looks like this: ```sql CREATE PROCEDURE UpdateInventory @OrderID INT AS BEGIN BEGIN TRANSACTION; TRY -- Logic to adjust inventory levels based on the order UPDATE Inventory SET Quantity = Quantity - 1 WHERE ProductID = (SELECT ProductID FROM Orders WHERE ID = @OrderID); COMMIT TRANSACTION; END TRY BEGIN CATCH ROLLBACK TRANSACTION; THROW; END CATCH END ``` What's happening is that sometimes when `ProcessOrder` is executing, I get the following deadlock behavior: ``` Transaction (Process ID 55) was deadlocked on lock resources with another process and has been chosen as the deadlock victim. Return the transaction. ``` I’ve tried adding `WITH (NOLOCK)` hints to my queries, but they don’t seem to resolve the scenario. I also considered implementing a retry logic around the calls, but I want to make sure that I address the deadlock at the source first. Any advice on how I can restructure my stored procedures or queries to avoid these deadlocks? Are there any specific best practices for handling transactions in nested stored procedures that I should follow? My development environment is Linux. Thanks in advance! I'm working with Sql in a Docker container on Ubuntu 20.04. Is there a simpler solution I'm overlooking?