Troubleshooting performance issues is a rather vast and complicated area, which we will only be able to touch upon lightly. In general, performance becomes a concern when a transaction is unable to be executed within a reasonable or expected time or when the system is unable to process expected volumes. Sometimes, this may be specific to a single transaction; other times, it may be something that affects every composite instance running on the server.
When server-wide performance problems occur, they impact most or all of the transactions currently being executed on your infrastructure. For example, if the dehydration store database is down, this will definitely have an impact on all the running instances.
Consider asking yourself a few questions to determine whether there is an overarching infrastructure problem:
Is logging in to Oracle Enterprise Manager Fusion Middleware Control extremely slow?
Are all composite instances getting...