WHEN I TRIED TO RESIZE THE TABLESPACE , I GOT THE FOLLOWING ERROR...

SQL> ALTER DATABASE DATAFILE '/hll05/oradata/hllrsnet/bev/index/bvbigcbx02.dbf' RESIZE 3400M;
ALTER DATABASE DATAFILE '/hll05/oradata/hllrsnet/bev/index/bvbigcbx02.dbf' RESIZE 3400M
*
ERROR at line 1:
ORA-01135: file 87 accessed for DML/query is offline
ORA-01110: data file 87: '/hll05/oradata/hllrsnet/bev/index/bvbigcbx02.dbf'
===========================================


SQL> ALTER DATABASE DATAFILE '/hll05/oradata/hllrsnet/bev/index/bvbigcbx02.dbf' ONLINE;
ALTER DATABASE DATAFILE '/hll05/oradata/hllrsnet/bev/index/bvbigcbx02.dbf' ONLINE
*
ERROR at line 1:
ORA-01122: database file 87 failed verification check
ORA-01110: data file 87: '/hll05/oradata/hllrsnet/bev/index/bvbigcbx02.dbf'
ORA-01200: actual file size of 396800 is smaller than correct size of 403200 bloc