手工dd将数据误写入undo数据文件,重启数据库，在alter database open时报如下错误：

ORA-01122: database file 3 failed verification check
ORA-01110: data file 3: '/u01/app/oracle/oradata/MEDB/undotbs01.dbf'
ORA-01251: Unknown File Header Version read for file number 3

直接alter database datafile 3 offline drop 时alert中出现：

Fri May 31 10:16:02 2019
alter database datafile 3 offline drop
Fri May 31 10:16:03 2019
Errors in file /u01/app/oracle/diag/rdbms/db/DB/trace/DB_dbw0_8543.trc  (incident=1713441):
ORA-00600: internal error code, arguments: [3600], [3], [2], [], [], [], [], []
Incident details in: /u01/app/oracle/diag/rdbms/medb/DB/incident/incdir_1713441/DB_dbw0_8543_i1713441.trc
Errors in file /u01/app/oracle/diag/rdbms/medb/DB/trace/MEDB_dbw0_8543.trc:
ORA-00600: internal error code, arguments: [3600], [3], [2], [], [], [], [], []
DBW0 (ospid: 8543): terminating the instance due to error 471
Instance terminated by DBW0, pid = 8543