How to create schema to enable work with multiple users during developmet

Hi,
My goal is to enable all developers in the team to work on the same database and schema name installed on some server in the company but each developer will have a "personal" instance of the schema (so changes made to the database will not harm the other developers) and the connection to the schema will possibly made through different port (1521, 1522, 1523 etc). This kind of work is needed on developing time and possibly for the QA team. The oracle server is installed on some server and client installation can be installed (if needed) on each developer machine.
What do i need to do in order to achieve this goal (if it possible at all) ?
I am using Oracle 9.2
Thanks a LOT for any help.
simon.
Message was edited by:
user488209

> Oracle and JBoss and Hibernate which is my
persistence layer so Pl/SQL is not needed (right?)
Simon, I would have taken a virtual lead pipe to you if you worked in our dev shop and made that statement. :-)
Data persistance layers in the middle tier are fundementally flawed.
Why? Because they attempt to do what the database is already doing. The database's core function is data persistance, data integrity, data processing.
It does this better than any other piece of software in the architecture. If not, then why use a database tier (usually the most expensive one) anyway? What are the benefits? Why not simply persist the data in the middle tier and use file-based (not database-based) storage mechanism?
Simple example. An employee object persist in the middle tier. Performance becomes a problem. JBOSS and other app server s/w scaled by adding more h/w. So now you have that employee object persisting as copies across several app platforms.
One of the fundemental relational principles of dealing with a single copy of data is violated. Multiple copies exist. They need to be kept in sync'ed. Locking needs to be handled in a distributed fashion. And what happens when a batch process on the database, oblivious to the persistant copies in the app tier, changes that employee's data?
Guess what.. the database does all this for you. Locking. Data integrity. Scalability. Etc.
AND IT DOES IT BETTER THAN WHAT THE APP TIER CAN!
So to answer your question. I write entire applications and systems in PL/SQL. Yes, PL/SQL is a capable language. Yes, anything you can do in Java (as far as data processing goes), PL/SQL does better and faster with more inherant scalability - with less development time. Fact and not opinion.
Oracle has in excess of a million lines of PL/SQL source code for the Oracle Applications product suite. So PL/SQL is a "serious" language.. not something that is simply used for the odd thing.
Performance wise? Oracle Replication is entirely written in PL/SQL - and not in something like C/C++ (which usually also outperforms Java).
90% of all the code that we write, is PL/SQL. The remainder is Java (JBOSS) and Perl with some Pro*C legacy stuff (most of which is rewritten as PL/SQL). In fact, I think the guys now write more Perl code than Java (doing processing that needs to be done totally outside Oracle). And JBOSS is an integrated architecture that we're using... (we even have a JBOSS cluster with a Linux Virtual Server/Director as gateway)
Not using PL/SQL? That will be a critical mistake. (I suggest that you visit http://asktom.oracle.com for more details on PL/SQL, Java, application tiers and database tiers).

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