如何检测MySQL中的死锁?在连接时，是什么原因导致我的应用程序挂起?

I have an application that is having some issues with the database: suddenly it freezes when it tries to open a connection to the database (or executing a query, this is not clear). There is no error message. I am suspecting that there is some query blocking others and I am trying to figure out what is that. I usedI have an application that is having some issue