adminDb = db.getSiblingDB("admin")
testDb = db.getSiblingDB("testdb")
adminDb.addUser({user:'admin',pwd:'password',roles:['userAdminAnyDatabase','dbAdminAnyDatabase', 'readWriteAnyDatabase']})
adminDb.auth('admin','password')
testDb.addUser({user:'readUser',pwd:'password',roles:['read']})
testDb.setProfilingLevel(2)
adminDb.logout()
testDb.auth('readUser','password')
testDb.system.profile.find() // succeeds