3.问题定位
对于本案例，通过Metalink获得以下解释:
Problem Description
-------------------
The Oracle Spatial Option has been installed and you are encountering
the following errors while trying to drop a user, who has no spatial tables,
connected as SYSTEM:
ERROR at line 1:
ORA-00604: error occurred at recursive SQL level 1
ORA-00942: table or view does not exist
ORA-06512: at line 7
A 942 error trace shows the failing SQL statement as:
DELETE FROM SDO_GEOM_METADATA_TABLE WHERE SDO_OWNER = ''
Solution Description
--------------------
(1) Create a synonym for SDO_GEOM_METADATA_TABLE under SYSTEM which points to
MDSYS.SDO_GEOM_METADATA_TABLE.
对于本例，为MDSYS.SDO_GEOM_METADATA_TABLE创建一个同义词即可解决.
是相对简单的情况.
(2) Now the user can be dropped connected as SYSTEM.
Related Documents
-----------------
ORA-604 and ORA-942 Reported During DROP USER CASCA
4.实际处理
MDSYS.SDO_GEOM_METADATA_TABLE为Spatial对象
如果未使用Spatial选项，可以删除
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SQL> connect / as sysdba
Connected.
SQL> select * from dba_sdo_geom_metadataorder by owner;
select * from dba_sdo_geom_metadataorder by owner
*
ERROR at line 1:
ORA-00942: table or view does not exist
ORA-04063: view "MDSYS.DBA_SDO_GEOM_METADATA" has errors
SQL> select object_name from dba_objects where object_name like '%SDO%';
OBJECT_NAME
--------------------------------------------------------------------------------
ALL_SDO_GEOM_METADATA
ALL_SDO_INDEX_INFO
ALL_SDO_INDEX_METADATA
DBA_SDO_GEOM_METADATA
DBA_SDO_INDEX_INFO
DBA_SDO_INDEX_METADATA
....
DBA_SDO_GEOM_METADATA
DBA_SDO_INDEX_INFO
...
SDO_WITHIN_DISTANCE
USER_SDO_GEOM_METADATA
USER_SDO_INDEX_INFO
USER_SDO_INDEX_METADATA
88 rows selected.
SQL> drop user MDSYS cascade;
User dropped.
SQL> select owner,type_name from dba_types where type_name like 'SDO%';
no rows selected
SQL>
SQL> alter session set sql_trace=true;
Session altered.
SQL> drop user wapcomm;
User dropped.
SQL> alter session set sql_trace=false;
Session altered.
SQL> exit
Disconnected from Oracle8i Enterprise Edition Release 8.1.7.4.0 - 64bit Production
With the Partitioning option
JServer Release 8.1.7.4.0 - 64bit Production
.
[/php]
这时用户得以顺利drop
