UNDO表空间数据文件切换
1 新建一UNDO表空间
CREATE UNDO TABLESPACE UNDOTBS DATAFILE ‘/dev/vx/rdsk/vgora/lv_undo‘ SIZE 10M AUTOEXTEND ON RETENTION NOGUARANTEE;
2 切换表空间
alter system set undo_tablespace=‘UNDOTBS1‘;
shutdown immediate;
startup
drop tablespace UNDOTBS2 including contents and datafiles;
CREATE UNDO TABLESPACE UNDOTBS1 DATAFILE ‘/dev/vx/rdsk/vgora/lv_undo‘ size 6000M;
alter tablespace UNDOTBS1 add datafile ‘/dev/vx/rdsk/vgora/lv_undo1‘ size 8000M;
alter system set undo_tablespace=‘UNDOTBS1‘;
drop tablespace UNDOTBS including contents and datafiles;
shutdown immediate;
startupundo表空间
原文：http://blog.csdn.net/jenya007/article/details/40370731
