Kurt, The links dose not effect the structures of database, they only help you to view / update or retrive the data and the security issue is the user's responsibilty, So the links should be safe and add on help for a hetrogenious database environment. Nisar Tareen Kurt McKeown <kurt_mckeown@xxxxxxxxxxxx> wrote: Can anybody tell me if it is generally save to use database links between different versions of Oracle, e.g. between 9.2.0.1. and 9.2.0.5 or between 9.2.0.1. and 10.1.0.2? I couldn't find an official statement about that aspect in the Oracle documentation. Thanks, Kurt ===== ----------------------------------------------------------- Find local movie times and trailers on Yahoo! Movies. http://au.movies.yahoo.com --------------------------------- Do you Yahoo!? The all-new My Yahoo! ? Get yours free!