MySQL 8.0 - How to handle 'Deadlock found when trying to get lock; try restarting transaction' scenarios in Laravel?
I'm migrating some code and I tried several approaches but none seem to work. I'm working with a frustrating scenario with deadlocks in MySQL 8.0 while using Laravel's Eloquent ORM. My application frequently hits the 'Deadlock found when trying to get lock; try restarting transaction' behavior during high concurrency operations, particularly when multiple users attempt to update the same records simultaneously. I've implemented optimistic locking using the `updated_at` timestamp, but this doesn't seem to prevent the deadlocks. Here’s a snippet of the relevant code where I perform the updates: ```php DB::transaction(function () { $post = Post::find($postId); $post->title = $request->input('title'); $post->save(); }); ``` This operation is wrapped in a database transaction. I’ve also tried increasing the `innodb_lock_wait_timeout` setting, but the deadlocks still occur. I've examined the query logs and noticed that the deadlocks happen mostly between two similar update queries that involve foreign key dependencies. Should I consider changing my transaction isolation level or rethinking my database design to reduce contention? Any insights on best practices for handling such scenarios would be greatly appreciated. My development environment is macOS. I'd really appreciate any guidance on this. For context: I'm using Php on Windows.