oracle 10g中SCN和timestamp转换

首先通过dbms_flashback.get_system_change_number 可以获得系统当前的SCN值：

SQL> col scn for 9999999999999
SQL> select dbms_flashback.get_system_change_number scn from dual;

 

SCN

        5223711

 再通过SCN找出其时间
    select scn_to_timestamp(5223711) scn from dual;