Patrick > The main caveat I picked up from Tom Kyte's talk was that tables are not > "versionable". So if one of our upgrades included a change to a table > then the above approach would not work, and we would have to suffer > downtime, as currently. This could be mitigated by encouraging table > access via views. Oracle's idea, as mentioned from Tom in his presentation, is to solve such situation with edition views and cross-edition triggers. Best regards, Chris -- http://www.freelists.org/webpage/oracle-l