物化视图无法删除

业务需要，需要重新创建物化视图，这里顺便提一句，如果知道怎么重命名物化视图，麻烦教我一下
drop materialized view appclient.user_role;
执行删除语句，结果就一直在执行，换了个窗口查了下对应的sid，然后查了下v$session_wait

SQL> select sid,seq#,event from v$session_wait where sid=238;

       SID       SEQ# EVENT

---------- ---------- ----------------------------------------------------------------

       238        405 enq: JI - contention

这个等待事件头次见，上网查了一下，有人查过metalink，对我这种在穷公司的人来说是好事
Symptoms
Refresh session is waiting for enq: JI - contention.

10046 trace of the waiting refresh session shows repeating messages like the following:

WAIT #4: nam='enq: JI - contention' ela= 489125 name|mode=1246298118 view object #=78868 0=0 obj#=-1 tim=1285069467387125 

Cause
JI enqueue is used to serialize the refresh of an materialized view object,  JI enqueue is acquired when a materialized view refresh is being performed on an aggregate join view (AJV), is used to ensure that two or more refresh processes do not try to refresh the same object.


Solution
You may want to see which session is holding the JI enqueue with the help of Note 1020008.6 or Note  1020007.6.
If the JI enqueue holder is an intended refresh session, the other session(s) that intend to refresh the same mview may just need to wait until the first one finishes.

If however the JI enqueue holder session is stuck (e.g. was killed without the immediate option), then you may want to take further actions to remove/terminate this session, so that the intended refresh can acquire the JI enqueue on the mview and proceed with the refresh.

大体意思就是有其他session抢占资源，所以一直在等待。突然想到刷新物化视图的job，于是查了下正在执行的job

SQL> select * from dba_jobs_running;

       SID        JOB   FAILURES LAST_DATE           LAST_SEC         THIS_DATE           THIS_SEC        INSTANCE

---------- ---------- ---------- ------------------- ---------------- ------------------- ---------------- ----------

       253         61          0 2012-01-31 04:31:09 04:31:09         2012-01-31 04:41:10 04:41:10          0
果然是卡死了，于是手动清除，一直在用从eagle那学来的方法

SQL> select sid,serial# from v$session where sid=253;

       SID    SERIAL#

---------- ----------

       253      14396

SQL> alter system kill session '253,14396';

alter system kill session '253,14396'

*

第 1 行出现错误:

ORA-00031: 标记要终止的会话

SQL> select spid from v$process where addr  IN (SELECT x.ADDR FROM x$ksupr x,v$session s WHERE s.paddr(+)=x.addr and bit

);

SPID

------------

2824

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orakill 2824
等一会，卡住的job就被删掉了，删除物化视图成功

SQL> drop materialized view appclient.user_role;

实体化视图已删除。

SQL> commit;

提交完成。

SQL>

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