ORA-00257: archiver error. Connect internal only, until freed

ORA-00257: archiver error. Connect internal only, until freed 

登录oracle显示上面的错误 

以下是公司大师给出的步骤，谨记录备用： 
1、手工删除归档日志的文件夹（按日期那种） 
2、在oracle用户下以rman target / 
3、crosscheck archivelog all; 
4、delete expired archivelog all;--这里删除了一些与第1步中删除的文件日期匹配的文件，目前研究还不深入，不清楚它们之间具体的联系 
5、exit; 

--如果发现归档日志的空间快使用完了，而没有出现00257的错误，只做到这一步就够了，不用再进行下面的步骤了 
--查询归档日志使用的sql:select * from v$flash_recovery_area_usage; 

6、接下来是在sqlplus中的操作： 

SQL> conn / as sysdba
Connected.
SQL> shutdown immediate
ORA-01013: user requested cancel of current operation
//一直停不掉，就ctl+c中断了

//再试一次
SQL> shutdown immediate
ORA-01013: user requested cancel of current operation
//还是停不掉，再次ctl+c中断

//强行停止吧
SQL> shutdown abort
ORACLE instance shut down.

//再次启动
SQL> startup
ORACLE instance started.

Total System Global Area 1610612736 bytes
Fixed Size                  1267740 bytes
Variable Size             452986852 bytes
Database Buffers         1140850688 bytes
Redo Buffers               15507456 bytes
Database mounted.
ORA-16014: log 2 sequence# 101 not archived, no available destinations
ORA-00312: online log 2 thread 1: '/oracle/oradata/orcl/redo02.log'
ORA-00312: online log 2 thread 1:
'/backup/oracle_archive/redo_data/redo2/redo021.log'
//数据库没有打开，报上面的错误

SQL> show parameter db_recovery_file_dest_size;

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
db_recovery_file_dest_size           big integer 4G
SQL> select group#,sequence#,archived,status from v$log;

    GROUP#  SEQUENCE# ARC STATUS
---------- ---------- --- ----------------
         1        103 NO  CURRENT
         3        102 NO  INACTIVE
         2        101 NO  INACTIVE

//搞一搞SEQUENCE号最小的一个
SQL> alter database clear logfile group 2;
alter database clear logfile group 2
*
ERROR at line 1:
ORA-00350: log 2 of instance orcl (thread 1) needs to be archived
ORA-00312: online log 2 thread 1: '/oracle/oradata/orcl/redo02.log'
ORA-00312: online log 2 thread 1:
'/backup/oracle_archive/redo_data/redo2/redo021.log'

SQL> alter database clear unarchived logfile group 2;

Database altered.

SQL> alter database open;

Database altered.