Ultimately, those queries you want to batch are either: 1. Not critical to the logic of your app and thus should be fairly obvious candidate for caching. 2. C

Ultimately, those queries you want to batch are either: 1. Not critical to the logic of your app and thus should be fairly obvious candidate for caching. 2. Critical to the logic of your app and quite possibly done within a specific DB connection / transaction for locking reason. Trying to be too clever and parallel often flounders on mundane things like running out of DB connections.