oracle物化 View 刷新时间

Question

谁能告诉我使用以下设置刷新物化 View 的频率？

REFRESH FORCE ON DEMAND START WITH sysdate+0 NEXT (round(sysdate) + 1/24) + 1

我想我每小时都读一遍，但我不确定

Answer 1

SQL> alter session set nls_date_format = 'yyyy-mm-dd :hh24:mi:ss';

Session changed.

SQL> select sysdate from dual;

SYSDATE
--------------------
2008-12-19 :12:18:28

SQL> select (round(sysdate) + 1/24) + 1  from dual;

(ROUND(SYSDATE)+1/24
--------------------
2008-12-21 :01:00:00