在上一篇文章中，已经点到了数据库改名时，引起该schema下物化视图会失效的问题。从表面上看，该物化视图是删也删不掉，那当然就无法重建了。以下是实验过程：
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
SQL> conn yyf123/yyf123
SQL> select s.owner,s.object_name,s.object_type,status from dba_objects s where object_name=‘EMP‘ ;
OWNER OBJECT_NAME OBJECT_TYPE STATUS
------------------------------ -----------------------------------------------------------
SCOTT EMP TABLE VALID
SCOTT EMP MATERIALIZED VIEW VALID
YYF123 EMP TABLE VALID
YYF123 EMP MATERIALIZED VIEW INVALID
SQL> drop table emp purge;
ERROR at line 1:
ORA-12083: must use DROP MATERIALIZED VIEW to drop "YYF123"."EMP"
SQL> drop materialized view emp;
Materialized view dropped.
既然提示已经删除了物化视图，那尝试着重建一下看看
SQL>CREATE MATERIALIZED VIEW emp
ON PREBUILT TABLE
REFRESH FORCE ON DEMAND
START WITH sysdate NEXT SYSDATE + 10/1442
as
SELECT * FROM [email protected]_to_scott;
*
ERROR at line 1:
ORA-00955: name is already used by an existing object
虽然上面删除物化视图的命令已经成功执行，但是请看dba_objects里面还有记录，也就是说并没有真正的删除。
select s.owner,s.object_name,s.object_type,status from dba_objects s where object_name=‘EMP‘ ;
OWNER OBJECT_NAME OBJECT_TYPE STATUS
------------------------------ ------------------------------ ------------------- ----------
YYF123 EMP TABLE VALID
YYF123 EMP MATERIALIZED VIEW INVALID
问题来了，就是因为存在对该物化视图的summary信息
SQL> select t.owner,t.summary_name,t.container_owner,t.container_name from dba_summaries t where owner=‘YYF123‘ ;
OWNER SUMMARY_NAME CONTAINER_OWNER CONTAINER_NAME
------------------------------ ------------------------------ ------------------------------ ------------------------------
YYF123 EMP YYF123 EMP
SQL> conn / as sysdba
SQL> drop summary yyf123.emp; <------------这就是解决问题的关键
接下来验证下是否已经清楚
SQL> select t.owner,t.summary_name,t.container_owner,t.container_name from dba_summaries t where owner=‘YYF123‘ ;
no rows selected
SQL>CREATE MATERIALIZED VIEW emp
ON PREBUILT TABLE
REFRESH FORCE ON DEMAND
START WITH sysdate NEXT SYSDATE + 10/1442
as
SELECT * FROM [email protected]_to_scott;
Materialized view created.
SQL> select count(*) from emp;
COUNT(*)
----------
14
SQL> exec dbms_mview.refresh(‘emp‘,‘c
PL/SQL procedure successfully completed.
到此为止，已经顺利解决。
reference:
http://dba.stackexchange.com/questions/4235/why-in-oracle-11gr2-i-cant-drop-the-materialized-view-with-the-same-user-that-c
DBA_SUMMARIES is ‘Description of the summaries accessible to dba‘;
DBA_SUMMARIES.OWNER is ‘Owner of the summary‘;
DBA_SUMMARIES.SUMMARY_NAME is ‘Name of the summary‘;
DBA_SUMMARIES.CONTAINER_OWNER is ‘Owner of the container table‘;
DBA_SUMMARIES.CONTAINER_NAME is ‘Name of the container table for this summary‘;
DBA_SUMMARIES.LAST_REFRESH_SCN is ‘The SCN of the last transaction to refresh the summary‘;
DBA_SUMMARIES.LAST_REFRESH_DATE is ‘The date of the last refresh of the summary‘;
DBA_SUMMARIES.REFRESH_METHOD is ‘User declared method of refresh for the summary‘;
DBA_SUMMARIES.SUMMARY is ‘Indicates the presence of either aggregation or a GROUP BY‘;
DBA_SUMMARIES.FULLREFRESHTIM is ‘The time that it took to fully refresh the summary‘;
DBA_SUMMARIES.INCREFRESHTIM is ‘The time that it took to incrementally refresh the summary‘;
DBA_SUMMARIES.CONTAINS_VIEWS is ‘This summary contains views in the FROM clause‘;
DBA_SUMMARIES.UNUSABLE is ‘This summary is unusable, the build was deferred‘;
DBA_SUMMARIES.RESTRICTED_SYNTAX is ‘This summary contains restrictive syntax‘;
DBA_SUMMARIES.INC_REFRESHABLE is ‘This summary is not restricted from being incrementally refreshed‘;