甲骨文：物化使用預建表時

我在甲骨文12.這段代碼使用預先建立的表選項的MV時遇到了問題工作正常查看不刷新：如預期甲骨文：物化使用預建表時

CREATE TABLE empt 
    (ename VARCHAR2(20), 
    empno INTEGER PRIMARY KEY); 

CREATE MATERIALIZED VIEW LOG ON empt 
    WITH SEQUENCE , rowid (empno) 
INCLUDING NEW VALUES; 

CREATE MATERIALIZED VIEW empt_MV 
    REFRESH FAST ON COMMIT 
    WITH ROWID 
    AS 
    SELECT count(*) numberofemps 
    FROM empt ; 

INSERT INTO empt VALUES ('A',1); 
COMMIT; 

SELECT * FROM empt_MV;

上選擇回報，：

NUMBEROFEMPS 
------------ 
      1

但是，如果我使用ON PREBUILT TABLE選項，則什麼都不會發生。我的意思是，MV仍然是空的：

drop materialized view empt_mv; 
drop materialized view log on empt; 
drop table empt; 

CREATE TABLE empt 
    (ename VARCHAR2(20), 
    empno INTEGER PRIMARY KEY); 

CREATE MATERIALIZED VIEW LOG ON empt 
    WITH SEQUENCE , rowid (empno) 
INCLUDING NEW VALUES; 

CREATE TABLE empt_MV (
    numberofemps NUMBER); 

CREATE MATERIALIZED VIEW empt_MV 
    ON PREBUILT TABLE 
    REFRESH FAST ON COMMIT 
    WITH ROWID 
    AS 
    SELECT count(*) numberofemps 
    FROM empt ; 

INSERT INTO empt VALUES ('A',1); 
COMMIT; 

SELECT * FROM empt_MV;

Previous Selects返回沒有行。

任何人都知道會發生什麼？

來源

2016-11-20 Jose M