ora-01157怎么解决

在数据库startup时,出现以下两个错误:
ora-01157:cannot identify/lock data file 8 -see DBWR trace file
ora-01110:data file 8 : '/data/app/oradata/zcmp/users01.dbf'

shutdown immediate;
startup mount;
alter database datafile '/data/app/oradata/zcmp/users01.dbf' offline;
alter database open;