How to recreate SYSTEM.DBF if it's broken

Question

My databse is in ARCHIVE mode and i have lost just SYSTEM.DBF. What can I do? I've tried the ALTER DATABASE CREATE DATAFILE but recreation of the SYSTEM.DBF can't be done such way.
Aslo I woild be obligue for helping me in such problem:
I've backed up my DB, but i such way:
-whole Ora81 directory
-whole admin directory
-and all archived redo logs,
(I've used ARCServe to do the backup, and oracle client backed up the DB such way).
Main question is how to recover DB from such backup?
best regards to all

Answer 1

I assume you have backed up all your data files too; you don't explicitly say that you did.
When you lose a SYSTEM tablespace data file, your recovery options are dramatically limited. You must recover your latest good back up of the missing data files, mount the database and recover before you can open the database.
Since this is a SYSTEM tablespace data file, you will not be able to open the database in much of any capacity without recovering first. Your efforts to recreate a black datafile are not productive efforts.
If you are responsible for your database and its contents matter then you you must read all you can and practice, practice, practice. Recovery options vary significantly between versions, and you must tune in your studying to your version. The concepts between all versions are remarkably similar, so once you master one version you will be OK on the others in any pinch.
Here's a good place to start reading:
http://otn.oracle.com/docs/products/oracle9i/doc_library/release2/server.920/a96519/toc.htm
Paying money and taking a course is highly recommended for this topic - it isn't an intuitive process that most people can assume they will learn rapidly - if if they learn other technical concepts quickly. Some get, and some don't.
Michael