Drop dbf file and then recover - possible?

We have to 'startup mount' our database and then
1. alter database datafile ....12.dbf offline
2. recover using backupcontrolfile until cancel.
Can we do this on oracle 9.1.7

Hi,
I am not sure if I have understood the question.
Here is my translation of my understanding:
- you have dropped a datafile and do not have a backup, right?
- you want to recover the lost datafile, right?
My question now is:
- how did you drop the file?
1. did you remove it on OS level?
2. did you drop the tablespace?
Here the possible answers:
=> 1: if you "just" removed the file from the OS it is no problem to recreate it and recover it, under the condition that you have all the redologs archived or online which contain all the changes applied to the db since the creation of the lost datafile. Oracle will know the creation change number for the file and will be able to create a new one. It works like this:
SQL > ALTER DATABASE CREATE DATAFILE '<name of your lost file>';
SQL> RECOVER DATAFILE '<name of your lost file>' -- number of the file is also possible
SQL > ALTER DATABASE DATAFILE '<name of your lost file> ONLINE;
=> 2: if you have dropped teh entire database by DROP TABLESPACE ... INCLUDING CONTENTES AND DATAFILES; it is a little more tricky. Now you first need a controlfile which still contains the talespace information, because the tablesapce has been removed from the controlfile with the drop stsatement. And you can only recover what is in the controlfile. So you need a backup of the old controlfile, either a binary controlfile backup or a backup from a trace controlfile backup.
In this case you must shutdown the db and startup with a backup controlfile. You must restore the entire db from backup and recover incomplete, which means loss of data!
You must recover the whole db to a point in time short before the drop tablespace. YOu can find the timestamp for the drop tablespace in the alertSID.log file.
The first thing you do is to take a full backup of the entire db including redologs and controlfile, just in case you make a mistake in order to be able to get back to where you started!!!
Then resore db from backup.
Then:
SQL> RECOVER DATABASE UNTIL TIME <timestamp> USING BACKUP CONTROLFILE;
Then you must open teh database with RESETLOGS:
SQL> ALTER DATABASE OPEN RESETLOGS;
The next thing you do is check if you met the point in time you wanted and then TAKE A NEW BACKUP OF THE ENTIRE DATABASE, because you do not have ya valid backup any more now. It is a new database you have, at least a new incarnation.
Let me know if this was helpfull or if I have completely misunderstood your question.
Good luck,
Lutz

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