我们在两台不同的服务器上有 Oracle 11gR1 RAC 两个实例，新的 undo 表空间UNDOTBS20140508创建了 30G，我想删除旧的UNDOTBSX02，我做了以下操作：
CREATE UNDO TABLESPACE UNDOTBS20140508 DATAFILE '+DATA/....../UNDOTBS20140508' SIZE 20G;
ALTER SYSTEM SET UNDO_TABLESPACE = UNDOTBS20140508;
DROP TABLESPACE UNDOTBSX02 INCLUDING CONTENTS AND DATAFILES;
尝试删除UNDOTBSX02 时，它显示以下错误：
Run Code Online (Sandbox Code Playgroud)Error starting at line : 13 in command - DROP TABLESPACE UNDOTBSX02 INCLUDING CONTENTS AND DATAFILES Error report - SQL Error: ORA-00604: error occurred at recursive SQL level 1 ORA-06502: PL/SQL: numeric or value error ORA-06512: at line 57 ORA-30013: undo tablespace 'UNDOTBSX02' …