清理归档日志：
archive log日志已满
ORA-00257:archiver error.Connect internal only,until freed错误的处理方法
1.用sys用户登录
sqlplus sys/pass@tt as sysdba
2.看看archiv log所在位置
SQL>show parameter log_archive_dest;
NAME TYPE VALUE
-----------------------------------------------------------------------------
log_archive_dest string
log_archive_dest_1string
log_archive_dest_10string
3.一般VALUE为空时，可以用archive log list;检查一下归档目录和log sequence SQL>archive log list;
Database log mode Archive Mode
Automatic archival Enabled
Archive destination USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence360
Next log sequence to archive360
Current log sequence362
4.检查flash recovery area的使用情况,可以看见archivelog已经很大了，达到96.62 SQL>select*from V$FLASH_RECOVERY_AREA_USAGE;
FILE_TYPE PERCENT_SPACE_USED PERCENT_SPACE_RECLAIMABLE NUMBER_OF_FILES
----------------------------------------------------------------------
CONTROLFILE.1301
ONLINELOG 2.9303
ARCHIVELOG96.620141
BACKUPPIECE000
IMAGECOPY000
FLASHBACKLOG000
5.计算flash recovery area已经占用的空间
SQL>select sum(percent_space_used)*3/100from v$flash_recovery_area_usage;
SUM(PERCENT_SPACE_USED)*3/100
-----------------------------
2.9904
6.找到recovery目录,show parameter recover
SQL>show parameter recover;
NAME TYPE VALUE
-----------------------------------------------------------------------------
db_recovery_file_dest string/u01/app/oracle/flash_recovery_area
db_recovery_file_dest_size big integer5G
recovery_parallelism integer0
7上述结果告诉我们，归档位置用的是默认值，放在flash_recovery_area下(db_recovery_file_dest 目录=/u01/app/oracle/flash_recovery_area)
[root@sha310.2.0]#echo$ORACLE_BASE
/u01/app/oracle
[root@sha310.2.0]#cd$ORACLE_BASE/flash_recovery_area/tt/archivelog
转移或清除对应的归档日志,删除一些不用的日期目录的文件，注意保留最后几个文件（比如360以后的）
---------------------------------------------------------------------------------------
注意:
在删除归档日志后，必须用RMAN维护控制文件，否则空间显示仍然不释放。

---------------------------------------------------------------------------------------
8.rman target sys/pass
[root@sha3oracle]#rman target sys/pass
Recovery Manager:Release10.2.0.4.0-Production on Tue Jan2001:41:262009
Copyright(c)1982,2007,Oracle.All rights reserved.
connected to target database:tt(DBID=4147983671)
9.检查一些无用的archivelog
RMAN>crosscheck archivelog all;
10.删除过期的归档
RMAN>delete expired archivelog all;
delete archivelog until time'sysdate-1';删除截止到前一天的所有archivelog
11.再次查询，发现使用率正常，已经降到23.03
SQL>select*from V$FLASH_RECOVERY_AREA_USAGE;
FILE_TYPE PERCENT_SPACE_USED PERCENT_SPACE_RECLAIMABLE
NUMBER_OF_FILES
----------------------------------------------------------------------
CONTROLFILE.1301
ONLINELOG 2.9303
ARCHIVELOG23.03036
BACKUPPIECE000
IMAGECOPY000
FLASHBACKLOG000
其它有用的Command:
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如果archive log模式下不能正常startup,则先恢复成noarchive log,startup成功后，再shutdown; shutdown immediate;
startup mount;
alter database noarchivelog;
alter database open;
shutdown immediate;
再次startup以archive log模式
shutdown immediate;
startup mount;
show parameter log_archive_dest;
alter database archivelog;
archive log list;
alter database open;
如果还不行，则删除一些archlog log
SQL>select group#,sequence#from v$log;
GROUP#SEQUENCE#
--------------------
162
364
263
原来是日志组一的一个日志不能归档
SQL>alter database clear unarchived logfile group1;
alter database open;
最后，也可以指定位置Arch Log,请按照如下配置
select name from v$datafile;
alter system set log_archive_dest='/opt/app/oracle/oradata/usagedb/arch'scope=spfile
或者修改大小
SQL>alter system set db_recovery_file_dest_size=3G scope=both;。