We lost the redo*.log files. The database is unmounted. I tried your solution:
STARTUP MOUNT
ALTER DATABASE OPEN RESETLOGS;
But we got here a message: "ORA-01139 : RESETLOGS option only valid after an incomplete database recovery." We were logged in as sys/sysdba. Our database is version 9i. How do we open the database again without great losses? We haven't a backup of this specific database.

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The next thing to try is to force some sort of incomplete recovery:
STARTUP MOUNT
RECOVER DATABASE UNTIL CANCEL;
Reply CANCEL at the next prompt
ALTER DATABASE OPEN RESETLOGS;
The only difference here is you are telling Oracle to perform incomplete recovery, but you are cancelling right away so as to force incomplete recovery.

This was first published in August 2006

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