启用自动归档却无法自动归档？

SQL> archive log list
数据库日志模式            存档模式
自动存档             启用
存档终点            d:\oracle\oradata\fox\archive
最早的联机日志序列     18
下一个存档日志序列   18
当前日志序列           20
SQL> alter system archive log group 2
  2  ;

系统已更改。

SQL> select * from v$log;

    GROUP#    THREAD#  SEQUENCE#      BYTES    MEMBERS ARC STATUS
---------- ---------- ---------- ---------- ---------- --- ----------------
FIRST_CHANGE# FIRST_TIME
------------- --------------
         1          1         20   10485760          1 NO  ACTIVE
      4006853 11-10月-10

         2          1         21   10485760          1 NO  CURRENT
      4007025 11-10月-10

         3          1         19   10485760          1 NO  INACTIVE
      4006702 11-10月-10


SQL> select * from v$log;

    GROUP#    THREAD#  SEQUENCE#      BYTES    MEMBERS ARC STATUS
---------- ---------- ---------- ---------- ---------- --- ----------------
FIRST_CHANGE# FIRST_TIME
------------- --------------
         1          1         20   10485760          1 NO  ACTIVE
      4006853 11-10月-10

         2          1         21   10485760          1 NO  CURRENT
      4007025 11-10月-10

         3          1         19   10485760          1 NO  INACTIVE
      4006702 11-10月-10

SQL> show parameter archive

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
archive_lag_target                   integer     0
log_archive_config                   string
log_archive_dest                     string
log_archive_dest_1                   string      location=d:\oracle\oradata\fox
                                                 \archive
log_archive_dest_10                  string
log_archive_dest_2                   string
log_archive_dest_3                   string
log_archive_dest_4                   string
log_archive_dest_5                   string
log_archive_dest_6                   string

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
log_archive_dest_7                   string
log_archive_dest_8                   string
log_archive_dest_9                   string
log_archive_dest_state_1             string      enable
log_archive_dest_state_10            string      enable
log_archive_dest_state_2             string      enable
log_archive_dest_state_3             string      enable
log_archive_dest_state_4             string      enable
log_archive_dest_state_5             string      enable
log_archive_dest_state_6             string      enable
log_archive_dest_state_7             string      enable

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
log_archive_dest_state_8             string      enable
log_archive_dest_state_9             string      enable
log_archive_duplex_dest              string
log_archive_format                   string      ARC%S_%R.%T
log_archive_local_first              boolean     TRUE
log_archive_max_processes            integer     2
log_archive_min_succeed_dest         integer     1
log_archive_start                    boolean     FALSE
log_archive_trace                    integer     0
remote_archive_enable                string      true
standby_archive_dest                 string      %ORACLE_HOME%\RDBMS