I believe that the SAP data dictionary is an application-specific data dictionary. However, the Oracle data dictionary still exists. Date: Tue, 21 Oct 2014 10:55:56 -0400 Subject: Re: Some body know the impact in performance of unused database options installed From: jcdrpllist@xxxxxxxxx To: iggy_fernandez@xxxxxxxxxxx CC: oracle-l@xxxxxxxxxxxxx If I remember SAP did that, created all by themselves. 2014-10-20 15:40 GMT-04:00 Iggy Fernandez <iggy_fernandez@xxxxxxxxxxx>: At the risk of being booed, I cannot help thinking that the database with the least overhead as well as the most secure is one that has no data dictionary or options whatsoever; that is, one created with CREATE DATABASE and nothing else. Yes, you will be able to create users, tables, indexes, etc but you will have no data dictionary whatsoever. No DBA_TABLES. No overhead and no "attack vectors" either. Am I completely crazy? Stark raving mad? Iggy P.S. With just a little extra, you will be able to create PL/SQL functions, procedures, and triggers.