How to prevent developers from modifying the structure of DB

We are developing an application and using Oracle 8i as DB server. I don't want the developers to modify the structure of tables. They should only be able to insert/update/delete rows of the tables.
How can I make it?
Any suggestions will be appreciated.

A good rule is that no one logs in as the schema owner. You could give the schema owner a strong password, and not share it with the developers. Then create a role. Every time you make a table in this schema, be sure you're logged in as the schema owner, then grant select,insert,update,delete on the table to the role. Better yet, make two roles. Grant select on all tables to one role, which will be a readonly role. Grant select,insert,update,delete to the other role.
Then, you can grant one of the roles to your developers -- the readonly role or the read/write role, as you choose. As you add tables, grant access to them to the roles and the users with the role automatically get DML access -- but not DDL access.
Be sure to check which system privileges and roles your users already have. If you've made them all DBAs, all bets are off! 8)

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