ocr: 4. New database connection has deen rerouted to engine2 - through engine 0 transparently. - 3.1 Having authenticated the new connection, engine 0 passes the filedescriptor to the least busy engine, engine 2, - Newuser 2. Engine 0 accepts the connection arives. connection requestwith at brand-newt file descriptor. FIGURE 1. The four steps of migrating file descriptor in a three-engine SQL Server: scenario.