Writing sql or any code is an iterative process. Most of the time that means to see what you have done say 5 minutes ago means how big is your undo buffer or better is if you are in SQL Developer there's a full blown history. If you are in sqlplus, you are basically out of luck.
History
SDSQL has built in history and between sessions. We are still jiggling where it stores the history soImage may be NSFW.
Clik here to view.
Clik here to view.
