Joomla Module Development: Check during runtime for a change module setting

Question

I'm developing a joomla module, where I want to do some recalculation of the output, if the admin changes a specific module setting. One way to implement this, would be to use an additional table, where the setting since the last call is saved and compared to the current setting. However this means, that I would need an additional table, which does not look elegant and simple to me. So I was wondering if there is a better way to realize this feature?

To make it more clear: The admin can switch between OpenStreetMap and Google Maps. If he changes the field I need to make a search request during the next module call and save the result to the database.
Pseudo-Code Example:

if(changed($params->get('searchprovider')) == true){
$result = searchRequest();
saveResultToDatabase($result);
}
$dbResult = loadResultFromDatabase();
showResult($dbResult);