Dear all, In our application made in Caché object script, when we deploy some classes modified we have the option of calling "Purge queries" feature of Caché. We only were doing this call when a %Persistent class definition (table) was modified, as we assume that no other changes affect the cached queries and we don't  want to purge them by default, as the first run of a query becomes slow. We had a case where no table definition was changed but a purge queries was the solution. Do you know if any other change could affect the cached queries and a purge queries is necessary?  Regards,