SQL Server: Deadlock during bulk insert operations with multiple transactions
I'm building a feature where I'm learning this framework and After trying multiple solutions online, I still can't figure this out..... Hey everyone, I'm running into an issue that's driving me crazy. I'm working with a deadlock scenario when performing bulk insert operations into a SQL Server 2017 database while multiple transactions are running concurrently. My application uses Entity Framework Core, and I'm handling the bulk inserts within a transaction to ensure data integrity. Here's a simplified version of my code: ```csharp using (var transaction = await _context.Database.BeginTransactionAsync()) { var bulkData = GetDataToInsert(); await _context.BulkInsertAsync(bulkData); await transaction.CommitAsync(); } ``` The `GetDataToInsert()` method retrieves a list of records to be inserted. However, during peak times when multiple users trigger this method simultaneously, I often get the following behavior: ``` Transaction (Process ID XX) was deadlocked on lock resources with another process and has been chosen as the deadlock victim. Rerun the transaction. ``` I have tried several approaches to mitigate this scenario, including: 1. Implementing retry logic for the transactions that unexpected result due to deadlocks. 2. Adding a `WITH (ROWLOCK)` hint to the inserts, which I thought might help reduce the locking contention. 3. Adjusting the isolation level of my transactions to `READ COMMITTED SNAPSHOT`, but that didn't seem to make a noticeable difference. I suspect that the deadlock occurs due to the combination of multiple inserts happening at the same time and possibly other transactions that are reading from or writing to the same tables. Is there a better approach or best practice I should consider to reduce the likelihood of deadlocks in this scenario? Any insights or solutions would be greatly appreciated! I'm working on a web app that needs to handle this. This is part of a larger service I'm building. Has anyone else encountered this? I recently upgraded to C# 3.9. Any ideas what could be causing this? This is part of a larger microservice I'm building.