Oracle 10g: Is it possible to designate a undo point?
John has pointed you at the Flashback Query options useful from a developers point of view. If I read you correctly then you are probably looking for the Flashback Database and Restore Point functionality documented here which allows you to do precisely this. Flashback Database does have some requirements over and above the flashback query functionality (for example it requires a flash recovery area to be configured and extra disk space compared to a non-flashback database ).