What do you suggest me for task "please comment up all database tables"

Question

I have in Oracle 10g database in one schema ca 600 ("business") tables created. Most of those tables don't have comments.
I don't understands most of the tables, and no one does. Can you give me some hints, how i should start to comment those tables?
I just want to put firstly comments to tables, later i will comment columns.
I understand that some tables are with mandatory data to the System, something like table ala "SystemRights" would sound to be with mandatory 3 rows that are needed for System to run up. some tables doesn't contains mandatory data for the System, like ala "UserOptions" which sounds like it contains data that User has inserted for herself, so this data is not important for the System. I could maybe distinguish between tables other way, maybe some other hints are important to clarify the purpose of the table.
Can you suggest something helpful how i should do the commenting of those 600 tables?
If you are amazes that there doesn't exist not much persons who could know the porpouse of the tables, then you shouldn't be amazed, take this as reality.
I won't dig into Java code that uses those tables, i believe there wont be much comments either anyway.

Answer 1

Should i do so:
1. run query to get table listing:
SELECT 'select * from ' || t.Table_Name t, c.Comments, COUNT(*) Over() Cnt
FROM User_Tables t, User_Tab_Comments c
WHERE c.Table_Name = t.Table_Name
ORDER BY t.Table_Name;2. From table list take one table into attention.
3. Run "select * from" to see data of the table.
4. Now look the data and look the table name and try to figure out what the data represents.
5. Then open table definition in Tool/IDE to see if table contains FK-columns. Open the tables pointing by FK-keys and to light analyzing of them.
6. Now look the data of the table again and figure out the porpouse of the table and write it down as table comment.