URGENT RECOVERY

Guys,
   
  Trying to restore and recover and when I get to a specific archive file the 
database produces ora-600 errors and the database crashes.
   
  When I go to an earlier archive then I get ora-01547, ora-01245.
   
  I am copying backup files and starting again.  
   
  I am wondering if I go back even farther if it will work but then I will have 
lost a few hours on the database.  
   
  Would going to the point where I get the ora-01547, ora-1245 and then doing a 
offline drop on those datafiles work?  Then I could recreate those datafiles, 
tablespaces and import those users/schemas.  
   
  How do I know for sure how far I can go with the archives and get my database 
back up and running??
   
  It looks like files where corrupted or overwritten with a previous file.  

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