'Update the default execution_options dictionary
of this :class:`.Engine`.
The given keys/values in \**opt are added to the
default execution options that will be used for
all connections.  The initial contents of this dictionary
can be sent via the ``execution_options`` parameter
to :func:`.create_engine`.
.. seealso::
:meth:`.Connection.execution_options`
:meth:`.Engine.execution_options`'

def update_execution_options(self, **opt):

    self._execution_options = self._execution_options.union(opt)
    self.dispatch.set_engine_execution_options(self, opt)
    self.dialect.set_engine_execution_options(self, opt)
