In alert log:
Tue Feb 16 11:51:02 2016 alter database mount Tue Feb 16 11:51:07 2016 Successful mount of redo thread 1, with mount id 958201638 Database mounted in Exclusive Mode Lost write protection disabled Completed: alter database mount Tue Feb 16 11:54:26 2016 Errors in file /u01/app/oracle/diag/rdbms/abstest/ABSTEST/trace/ABSTEST_ora_10509.trc: ORA-19930: file /u01/app/oracle/fast_recovery_area/ABSTEST/control02.ctl has invalid checkpoint SCN 0
Cause: When opening the file to be placed in a copy or backup set, to be inspected, the file header was not recognized as a valid header because it contained a invalid checkpoint SCN. The indicated file cannot be processed. Action: Ensure that the correct files are being specified for the catalog or backup operation.