> Once you fetch something from the db, you have it in variables in memory. With or without an ORM. That could no longer be sync'd with the db a ms later. Nope

> Once you fetch something from the db, you have it in variables in memory. With or without an ORM. That could no longer be sync'd with the db a ms later. Nope. The DBMS is making the same transaction isolation guarantees to an ORM as to any other client. I think the larger "source of truth" issue is how the schema is represented. All of these systems that provide their set of schema objects that are then pushed to the database. This works fine for LAMP stacks, but as soon as you grow it becomes apparent that you've put the horse before the cart.