连接数据库时提示归档器失败 ORA-00257: archiver error

（1）问题现象

SQL> conn hr/hr
ERROR:
ORA-00257: archiver error. Connectinternal only, until freed.
Warning: You are no longer connected toORACLE.

（2）问题分析

在oracle 10g后，若flashback开启，后台归档程序进行(ARCn)将会自动在闪回恢复区中创建每个归档重做日志的一个副本，而flashback区域有大小限制：

SQL> show parameter recovery
 
NAME                                 TYPE        VALUE
----------------------------------------------- ------------------------------
db_recovery_file_dest                string      /opt/oracle/flash_recovery_area                                      
db_recovery_file_dest_size           big integer 3882M
recovery_parallelism                 integer     0

当falshback空间已满，则连接数据库失败。

（3）问题解决

l 删除部分归档日志

l 增加falshback的空间限制

SQL> alter system set DB_RECOVERY_FILE_DEST_SIZE=20g;
System altered.

（4）监控flashback

l 查看闪回恢复区的相关信息

SQL> select * from v$recovery_file_dest;
NAME                                     SPACE_LIMITSPACE_USED SPACE_RECLAIMABLE NUMBER_OF_FILES
--------------------------------------------------- ---------- ----------------- ---------------
/opt/oracle/flash_recovery_area           2.1475E+10 4190778368                 0              95

l 查看flash area的使用率

SQL> select * from v$flash_recovery_area_usage;
 
FILE_TYPE            PERCENT_SPACE_USEDPERCENT_SPACE_RECLAIMABLE NUMBER_OF_FILES
-------------------- ------------------------------------------- ---------------
CONTROL FILE                          0                         0               0
REDO LOG                              0                         0               0
ARCHIVED LOG                      19.51                         0              95
BACKUP PIECE                          0                         0               0
IMAGE COPY                            0                         0               0
FLASHBACK LOG                         0                         0               0
FOREIGN ARCHIVED LOG                  0                         0               0
 
7 rows selected.

其它内容请参考  

oracle之Flash Recovery Area全面介绍 

http://blog.csdn.net/jediael_lu/article/details/8854477