UNDO文件迁移1.开归档2.新建一个undo表空间createundotablespaceundotbs2datafile'xxxx'size1gautoextendon;3.切换表空间altersystemsetundo_tablespace='undotbs2';4.停用undoaltertablespace undotbs1offline;5.offline需要迁移的undo文件alterdat