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One can roll-forward until a specific point-in-time (before the disaster occurred), or roll-forward until the last transaction recorded in the log files.This is probably not the appropriate time to be sarcastic, but, recovery without backups are not supported.Hopefully you'll then be able to load the data into a working database.Note that DUL does not care about rollback segments, corrupted blocks, etc, and can thus not guarantee that the data is not logically corrupt.You know that you should have tested your recovery strategy, and that you should always backup a corrupted database before attempting to restore/recover it.
Recovery is the process of applying redo logs to the database to roll it forward.A cold (or off-line) backup is a backup performed while the database is off-line and unavailable to its users.Cold backups can be taken regardless if the database is in ARCHIVELOG or NOARCHIVELOG mode.It is intended as an absolute last resort and will most likely cost your company a lot of money!DUDE (Database Unloading by Data Extraction) is another non-Oracle utility that can be used to extract data from a dead database. Oracle exports are "logical" database backups (not physical) as they extract data and logical definitions from the database into a file.
Also test ALL backup and recovery scenarios carefully. Regardless of your strategy, also remember to backup all required software libraries, parameter files, password files, etc.