ORA-00603: ORACLE server session terminated by fatal error

ORA-00603: ORACLE server session terminated by fatal error
后台错误中发现是UNDO的问题
ORA-00600: internal error code, arguments: [4194], [98], [75], [], [], [], [], []
解决办法
1、通过错误信息可以确定当前回滚段是1-10，所以修改PFILE文件将下面这个隐含参数加到文件中去：
._corrupted_rollback_segments=true

STARTUP PFILE=’XXXX’
可以看到数据库已经正常启动
2、create undo tablespace undotbs2  datafile 'F:\data\oradata\cgnet\undotbs2.dbf' size 500m;
   alter system set undo_tablespace=undotbs2;
   drop tablespace undotbs1;
3、修改参数文件，变更undo表空间，并取消_corrupted_rollback_segments设置:
*.undo_tablespace='UNDOTBS2'
4、startup pfile='/or/oracle/product/10.2.0/dbs/initcgnet.ora'
   create spfile from pfile;
   shutdown immediate
   statup