无法删除 UNDO TABLESPACE

Question

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：

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' is currently in use
00604. 00000 -  "error occurred at recursive SQL level %s"
*Cause:    An error occurred while processing a recursive SQL statement
           (a statement applying to internal dictionary tables).
*Action:   If the situation described in the next error on the stack
           can be corrected, do so; otherwise contact Oracle Support.

我检查了UNDOTBSX02是否有任何待处理的交易，它是空的。那么怎么掉呢？

注意：我不是 Oracle DBA，但我必须执行此任务。

Answer 1

错误消息意味着正在tablespace使用，并且由于撤消tablespace至关重要，tablespace因此您需要首先使用以下命令将其关闭：

SELECT a.name,b.status , d.username , d.sid , d.serial#
FROM   v$rollname a,v$rollstat b, v$transaction c , v$session d
WHERE  a.usn = b.usn
AND    a.usn = c.xidusn
AND    c.ses_addr = d.saddr
AND    a.name IN ( 
          SELECT segment_name
          FROM dba_segments 
          WHERE tablespace_name = 'UNDOTBSX02'
         ); 

然后使用以下命令杀死撤消表空间的 SID

alter system kill session 'SID,serial'; --change the values of sid and serial by the ones  that being retrived from the previouse command

现在你应该可以放弃它了。