Oracle-L: RE: Hundreds of schemas in one instance?

From: Jack C. Applewhite <japplewhite_at_inetprofit.com>
Date: Wed, 06 Mar 2002 14:29:47 -0800
Message-ID: <F001.004215AB.20020306142947@fatcity.com>

Ben,

Have you investigated Oracle8i's "Virtual Private Database" feature - A.K.A. Fine-Grained Access Control (FGAC) or Row-Level Security (DBMS_RLS). It's available in 8i EE.

It keeps users logically separate, even if you only use one schema. I believe it would be much easier to maintain than hundreds of schemas - adding/deleting rows is much easier than adding/dropping schemas and their objects.

I implemented FGAC in an internationally-accessed Web-based application in which each customer's data was kept separate from every others, but in a single schema. Works very well.

Jack

Jack C. Applewhite
Database Administrator/Developer
OCP Oracle8 DBA
iNetProfit, Inc.
Austin, Texas
www.iNetProfit.com
japplewhite_at_inetprofit.com
(512)327-9068

-----Original Message-----
Sent: Wednesday, March 06, 2002 1:29 PM
To: Multiple recipients of list ORACLE-L

Our university wants to set up a server that will provide groups on campus with a standard set of services for web hosting, data collection or whatever they want to do. As much as possible each user should have their own isolated chunk of the server. An Oracle database will sit in the background to provide whatever database services they need. My thought is to go with one instance with a unique schema, including separate tablespaces/datafiles, for each user.

Some of the pros for this are:
- easy set up for new users

easy software upgrades
simplified tuning, backups, monitoring, auditing
user isolation, especially disk space usage
multiple instances would use far more memory

Some cons are:
- everyone must use the same release of the software

database down time affects everyone
might run into system maximums, for example max. number of datafiles
an enormous SYSTEM tablespace

Has anyone had to this kind of thing? Any comments or suggestions?

TIA, Ben

Ben Poels - Senior Technical Analyst - Queen's University at Kingston Phone: 613.533.2449 Fax: 613.533.2168 Email: poelsb_at_post.queensu.ca

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Author: Jack C. Applewhite
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Received on Wed Mar 06 2002 - 16:29:47 CST