When you need Oracle database recovery, before you choosing AUL(MyDUL), please check the following. Because AUL(MyDUL) can only be the last method you should choose, and it's not free, you will be charged.
Do you have backup available? This may be a stupid question, but one of my customers found they had a logical backup (by Export) somewhere one week after recovery with AUL(MyDUL) utility.
Does flashback help? Oracle introduced flashback table in 9i, and flashback database in 10g. One of my DBA friends tell me that it save him a lot of time to prevent human errors. So check your database configuration and check the document of how to flashback lost data.
Read the features overview of AUL(MyDUL), because compress tables and compress indexes are not supported, Oracle 7 is not supported, and some data types are not supported. And if your tablespace contains no more than 2 data files and the data file size is no larger than 256MB, you can use AUL freely.
And you should info Oracle about the DUL service. If you still continue to choose AUL(MyDUL), then please run dbv on your existing data files, if there are lot's of corrupted blocks, this tool may not help. Then talk to your boss that you want to buy the AUL license or service for the recovery.
No guarantee of 100% recovery of the damaged database, what AUL(MyDUL) do is to recover data as much as it can. Thanks for your trust of AUL, please tell me the database size, what's wrong with the database and which methods you have tried? How many tables need to be recovered? Did you lost the system tablespace? Without the system tablespace the recovery may be very complex, and sometime impossible (for CLOB/BLOB types).