[oracle]how to be a develop team dba

My suggestion is:

1) revoke all DBA privileges, only DBA team can have it;
2) Every developer can have his/her own schema, they can do whatever they like under their own schema;
3) Grant only select privs on other schemas for every schema owner, so they won't step onto each other;
4) For predeployment/Test/Staging databases, only grant DML privs to application users.

Note: You have to set up your team to take the responsiblity to do manitainance, replication, DDL support.