if we have already published an application on production , and there are a large number of records in the tables . then after working locally for 6 months we want to reflect the work on production . and we have a lot of attributes that have been added to the table with boolean type and a default value false .Does that will make problems on the database of production on mendix application because it will reflect that with the default value on all the records that already available on production database !! i want to make sure from this step before reflecting the changes on production . please advise
Existing rows with whatever value; whether default or not will remain untouched. Your new default value only has an effect on new records/instances of your entity. If you are adding a new attribute, existing rows will get the default value defined for that attribute if any.