Hi K Nani,
From your error message
ora_01122:database file 8 failed cerification check
ora_01110:datafile 8:d:\oracle\sid\sapdata1\sr3_5\sr3.data5'
ora_01251:unknown file header version read for file number 8
Looks like Data file is corrupted.
You may refer SAP note 696141 - Composite SAP Note: ORA-01122
10. ORA-01251: Unknown File Header Version read for file number <file_id>
- Reason: The file header cannot be correctly read.
- Solution: If you use Oracle 9.2 on WINDOWS and if you already installed the database with Oracle 7.2 or lower, see Note 636466.
Otherwise: Restore/recovery
Only solution here is restore the database from backup.
Alternate solution If it is a non-production system.
If the file is corrupted, then take the datafile offline and open the database.
Hope this helps
Regards,
Deepak Kori