How about storing column create date in [all/user/dba]_tab_cols views?
When we create an object e.g. table, we can easily get the object create date in dba_objects.
But when we alter the table to add a new column to the table, is it not a good to have feature that oracle can show the column_created_date in the view [all/user/dba]_tab_cols?
Cheers,
Manik.