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ORA-01186:

file string failed verification tests
Cause: The data file did not pass the checks to insure it is part of the database. See the accompanying error messages for the reason the verification failed.
Action: Make the correct file available to the database. Then, either open the database, or execute ALTER SYSTEM CHECK DATAFILES.
 SubjectReplies
1.file 24, couldnot online from a node (rac 9)2