temps d'actualisation de la vue matérialisée oracle

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