I would like to set a value on all of the rows in an entity - I need to be able to have this execute as fast as possible.

I would like to set a value on all of the rows in an entity.  I am using an iterator which is very slow because when I look at the update in APM it's actually building an "In" clause and then udpating the value.  Is there a way to do a direct update to the rows using a SQL update without a custom Java Action?