When did I add that column?

I am trying to determine when I added a few column to some tables. I know the columns but not when I added them...

Is there a way to easily determine the date the column was added? I don't see anything in DBA_TAB_COLUMNS.

I do do daily exports, I hope not to have to compare the dmp files.

may be you could check last_ddl in dba_objects, just an suggestion

i think i got my own answer, but for anyone's interest...

I uncompress my daily .dmp... I did the following (Unix only)

strings day_15.dmp | grep "CREATE TABLE" > 15.txt
strings day_22.dmp | grep "CREATE TABLE" > 22.txt

diff 15.txt 22.txt



that's it... I then see what was different.

good luck.