All SQL Service event you will set the Poll Interval to the amount of time between script runs. Also, you will set Step the SQL Step that the server will run on the datatabase to return values.
You can then add Read Steps to build more information into the Object and the Update stepe will run after the object is built so the server knows how to handle the object after it has it. Note, SQL Service events can't call a push to send the data to client.