在10g中，如果指定了db_recovery_file_dest 参数，那么归档日志将存放到这个参数指向的目录下，如果同时指定了log_archive_desc，则将同时往这两个参数指定的目录中归档。
1.只设置db_recovery_file_desc参数，log_archive_desc设置为空

SQL> show parameter db_recovery

NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
db_recovery_file_dest string /ora10g/flash_recovery_area
db_recovery_file_dest_size big integer 1G
SQL> show parameter log_archive_dest

NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
log_archive_dest string
log_archive_dest_1 string
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
log_archive_dest_7 string
log_archive_dest_8 string
log_archive_dest_9 string

NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
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
log_archive_dest_state_8 string enable
log_archive_dest_state_9 string enable
SQL> select name,completion_time from v$archived_log;

no rows selected

SQL> alter system switch logfile;

System altered.

SQL> select name,completion_time from v$archived_log;

NAME
--------------------------------------------------------------------------------
COMPLETION_TIME
-----------------
/ora10g/flash_recovery_area/EBANK/archivelog/2008_12_18/o1_mf_1_1_4no7w6tg_.arc
20081218 14:07:50


SQL> col name for a100
SQL> set lines 132
SQL> /

NAME COMPLETION_TIME
---------------------------------------------------------------------------------------------------- -----------------
/ora10g/flash_recovery_area/EBANK/archivelog/2008_12_18/o1_mf_1_1_4no7w6tg_.arc 20081218 14:07:50

2.设置log_archive_desc参数，同时db_recovery_file_desc参数被设置为空。