SQL> ALTER TABLESPACE SMSCSV_DEF READ ONLY;

ALTER TABLESPACE SMSCSV_DEF READ ONLY

*

ERROR at line 1:

ORA-00604: error occurred at recursive SQL level 1

ORA-00372: file 18 cannot be modified at this time

ORA-01110: data file 18: '/u02/oradata/smsdb2/SMSCSV_DEF_1.DBF'

ORA-06512: at line 7

其后查询状态，居然是READ ONLY。不得其解，做10046 TRACE 分析。

在TRACE文件中居然发现了如下内容

BEGIN

  --不记录服务器DDL操作

  IF Sys_Context('USERENV', 'HOST')<>'d3main' AND

     Sys_Context('USERENV', 'HOST')<>'mmsbi.d3space.com' AND

     Sys_Context('USERENV', 'TERMINAL')<>'unknown'

  THEN

   INSERT INTO ORADBA.T_Db_Ddllog

                (

                 LOGDATE      ,

                 USERNAME     ,

                 DDLTYPE      ,

                 OBJECTTYPE   ,

                 OBJECTNAME   ,

                 OBJECTOWNNER ,

                 HOSTNAME     ,

                 TERMINALNAME ,

                 OS_USER

                 )

          VALUES(SYSDATE,

                 USER,

                 sys.sysevent,                      --系统DDL事件

                 sys.dictionary_obj_type,           --操作类别table,procedure,index...

                 sys.dictionary_obj_name,           --操作对象名

                 sys.dictionary_obj_owner,          --操作对象拥有者?

                                                                                       Sys_Context('USERENV', 'HOST'),

                 Sys_Context('USERENV', 'TERMINAL'),

                 Sys_Context('USERENV', 'OS_USER')

                 );

  END IF;

END;

这个是一个记录DDL日志的触发器。写了日志文件到T­_DB_DDLLOG中，这个表刚好在SMSCSV表空间中存储，前面READONLY成功，后面又要写东西，怪不得报ORA-00372。将触发器禁用掉，问题解决。