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When I startup my database, I get an error and tells me that one of my datafile is missing. How can I bypass that error and start my database?

 

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You need to offline your datafile in order to startup your database:
First start your database with mount option.

SQL> CONNECT / AS SYSDBA
SQL> STARTUP MOUNT

Then offline the missing datafile. You should know the file#. The oracle error message tells you about that file number.

SQL> ALTER DATABASE DATAFILE nn OFFLINE;

Now, you should be able to open your database.
SQL> ALTER DATABASE OPEN;

 

 

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