7. Confirm that the table is now accessible by running the query from Step 2.
Recovering a Critical Datafile in Archivelog Mode
The datafiles that make up the SYSTEM and the currently active undo tablespace are
considered critical by Oracle, meaning that it is not possible to keep the database
open if they are damaged. The recovery technique is the same as that for a noncritical
datafile, with the exception that the recovery must be done in mount mode because
the database will have crashed and it will not be possible to open it. It is not necessary
to offline the damaged file. The steps are therefore:
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