Commercial database systems expose query hints to fix poor plans
produced by the query optimizer. However, current query hints are
not flexible enough to deal with a variety of non-trivial scenarios,
and can be at times cumbersome for DBAs to interact with. In this
demonstration we present a framework that enables visual specification
of hints to influence the optimizer to pick better plans. Our
framework goes considerably beyond existing hinting mechanisms
and significantly improves the usability of such functionality.