[Zope] temporary exclude page from ram-cache

Hi all, I have RAM-cached page that looks for data from SQLdb. For error suppression (yea, I use MSSQL which make sometime unbelievable SQL error with the same errorless query) I use try-except wrapper, but in some cases page is cached without db results for a looooong time. I know how to invalidate already rendered page from a ram cache, but I does not know how to temporal disable RAM-cache during rendering of that page. Many thanks, J. Lukesh