摘要：
开启归档日志SQL>shutdown immediate;SQL>startup mount;SQL>alter database flashback on;SQL>alter database archivelog;其它开启关闭方式alter database open; 打开数据库。archive log list; 查看是否开启了归档模式archive log start（stop）; 开启（停止）归档模式关闭归档日志SQL>shutdown immediate;SQL>startup mount;SQL>alter database flash 阅读全文
