author： headsen chen
date： 2018-04-17 11:12:39
notice：个人原创，转载请注明作者和出处，否则依法追击法律责任。
1，oracle数据库正常使用中，突然报ora-00257的错误，原因是归档日志满了，达到了oracle设置的满值的状态了，所以会无法连接了。
2，system登录数据库查看使用率和归档文件目录
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>
3, archive log list;检查一下归档目录和log sequence ,此时在序号512之前的都可以删除。
SQL>archive log list;
Database log mode Archive Mode
Automatic archival Enabled
Archive destination USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence 512
Next log sequence to archive 514
Current log sequence 514
4，检查flash recovery area的使用情况，查看archivelog使用率：99% (这里因为已经清理过了，没来得及截图，第一次清理时有99%)
SQL> select * from V$FLASH_RECOVERY_AREA_USAGE;
FILE_TYPE PERCENT_SPACE_USED PERCENT_SPACE_RECLAIMABLE NUMBER_OF_FILES------------ ------------------ ------------------------- ---------------CONTROLFILE 0 0 0
ONLINELOG 0 0 0
ARCHIVELOG43.73 0 215BACKUPPIECE 0 0 0
IMAGECOPY 0 0 0
FLASHBACKLOG .3 .22 4
6 rows selected.
上图中，说明归档日志满了，达到43.73%，需要清除过期的归档日志。
5，计算flash recovery area已经占用的空间 (已经清理过。没清理之前是2.99)
SQL> select sum(percent_space_used)*3/100 from v$flash_recovery_area_usage;
SUM(PERCENT_SPACE_USED)*3/100
-----------------------------
1.3209
6，找到recovery的目录
SQL> show parameter recover;
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
db_recovery_file_dest string /oracle/flash_recovery_area
db_recovery_file_dest_size big integer 20G
recovery_parallelism integer 0
SQL>
7，删除过期的归档文件
归档位置用的是默认值，放在flash_recovery_area下(db_recovery_file_dest目录=/oracle/flash_recovery_area)
[oracle@pen EC]$ echo $ORACLE_BASE
/oracle
[oracle@pen EC]$ cd /oracle/flash_recovery_area/EC/archivelog/
[oracle@pen archivelog]$ ls
[oracle@pen archivelog]$ ls
2018_01_01 2018_01_11 2018_01_21 2018_01_31 2018_02_10 2018_02_20 2018_03_02 2018_03_12 2018_03_22 2018_04_01 2018_04_11
2018_01_02 2018_01_12 2018_01_22 2018_02_01 2018_02_11 2018_02_21 2018_03_03 2018_03_13 2018_03_23 2018_04_02 2018_04_12
2018_01_03 2018_01_13 2018_01_23 2018_02_02 2018_02_12 2018_02_22 2018_03_04 2018_03_14 2018_03_24 2018_04_03 2018_04_13
2018_01_04 2018_01_14 2018_01_24 2018_02_03 2018_02_13 2018_02_23 2018_03_05 2018_03_15 2018_03_25 2018_04_04 2018_04_14
2018_01_05 2018_01_15 2018_01_25 2018_02_04 2018_02_14 2018_02_24 2018_03_06 2018_03_16 2018_03_26 2018_04_05 2018_04_15
2018_01_06 2018_01_16 2018_01_26 2018_02_05 2018_02_15 2018_02_25 2018_03_07 2018_03_17 2018_03_27 2018_04_06 2018_04_16
2018_01_07 2018_01_17 2018_01_27 2018_02_06 2018_02_16 2018_02_26 2018_03_08 2018_03_18 2018_03_28 2018_04_07 2018_04_17
2018_01_08 2018_01_18 2018_01_28 2018_02_07 2018_02_17 2018_02_27 2018_03_09 2018_03_19 2018_03_29 2018_04_08
2018_01_09 2018_01_19 2018_01_29 2018_02_08 2018_02_18 2018_02_28 2018_03_10 2018_03_20 2018_03_30 2018_04_09
2018_01_10 2018_01_20 2018_01_30 2018_02_09 2018_02_19 2018_03_01 2018_03_11 2018_03_21 2018_03_31 2018_04_10
切换到root用户，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)
[oracle@pen archivelog]$rm -rf 2018_01*
[oracle@pen archivelog]$ rm -rf 2018_02*
[oracle@pen archivelog]$ ls
2018_03_01 2018_03_06 2018_03_11 2018_03_16 2018_03_21 2018_03_26 2018_03_31 2018_04_05 2018_04_10 2018_04_15
2018_03_02 2018_03_07 2018_03_12 2018_03_17 2018_03_22 2018_03_27 2018_04_01 2018_04_06 2018_04_11 2018_04_16
2018_03_03 2018_03_08 2018_03_13 2018_03_18 2018_03_23 2018_03_28 2018_04_02 2018_04_07 2018_04_12 2018_04_17
2018_03_04 2018_03_09 2018_03_14 2018_03_19 2018_03_24 2018_03_29 2018_04_03 2018_04_08 2018_04_13
2018_03_05 2018_03_10 2018_03_15 2018_03_20 2018_03_25 2018_03_30 2018_04_04 2018_04_09 2018_04_14
8，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。(rman使用system用户登录，或者自创的chen用户登录，必须要有dba的权限)
[oracle@pen archivelog]$rman target chen/chen
[oracle@pen archivelog]$ rman target chen/chen
Recovery Manager: Release10.2.0.1.0 - Production on Tue Apr 17 11:30:03 2018Copyright (c)1982, 2005, Oracle. All rights reserved.
connected to target database: EC (DBID=1558596032)
RMAN>
9. 检查一些无用的archivelog
RMAN> crosscheck archivelog all;
archive log filename=/oracle/flash_recovery_area/EC/archivelog/2018_04_13/o1_mf_1_506_ff13y3dg_.arc recid=464 stamp=973364932validation succeededforarchived log
archive log filename=/oracle/flash_recovery_area/EC/archivelog/2018_04_14/o1_mf_1_507_ff2lbs2k_.arc recid=465 stamp=973412441validation succeededforarchived log
archive log filename=/oracle/flash_recovery_area/EC/archivelog/2018_04_14/o1_mf_1_508_ff3n9454_.arc recid=466 stamp=973447204validation succeededforarchived log
archive log filename=/oracle/flash_recovery_area/EC/archivelog/2018_04_15/o1_mf_1_509_ff4fvh4q_.arc recid=467 stamp=973473391validation succeededforarchived log
archive log filename=/oracle/flash_recovery_area/EC/archivelog/2018_04_15/o1_mf_1_510_ff6dv19y_.arc recid=468 stamp=973537890validation succeededforarchived log
archive log filename=/oracle/flash_recovery_area/EC/archivelog/2018_04_17/o1_mf_1_511_ffbs1s2f_.arc recid=469 stamp=973681465validation succeededforarchived log
archive log filename=/oracle/flash_recovery_area/EC/archivelog/2018_04_17/o1_mf_1_512_ffbs1s9l_.arc recid=470 stamp=973681466validation succeededforarchived log
archive log filename=/oracle/flash_recovery_area/EC/archivelog/2018_04_17/o1_mf_1_513_ffbs1tb9_.arc recid=471 stamp=973681466
...
Crosschecked215 objects
10, 删除过期的归档
RMAN> delete expired archivelog all; ------> 输入“YES” 确认。
......
archive log filename=/oracle/flash_recovery_area/EC/archivelog/2018_02_28/o1_mf_1_411_f9dx438b_.arc recid=375 stamp=969297667
Deleted 119 EXPIRED objects
下面这一条命令视情况而定，可以不执行。
RMAN>delete archivelog until time 'sysdate-1' ; 删除截止到前一天的所有archivelog
RMAN>exit(退出)
11，再次查询，发现使用率正常，已经降到19.57
SQL> sqlplus / as sysdba
SQL> select * from V$FLASH_RECOVERY_AREA_USAGE;
SQL> select * fromV$FLASH_RECOVERY_AREA_USAGE;
FILE_TYPE PERCENT_SPACE_USED PERCENT_SPACE_RECLAIMABLE NUMBER_OF_FILES------------ ------------------ ------------------------- ---------------CONTROLFILE 0 0 0
ONLINELOG 0 0 0
ARCHIVELOG19.57 0 96BACKUPPIECE 0 0 0
IMAGECOPY 0 0 0
FLASHBACKLOG .3 .22 4
6 rows selected.
这样，oracle的归档日志满的问题就解决了，可以登录和访问了。
补充：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;
操作命令如下：
shutdown immediate;
startup mount;
alter database noarchivelog;
alter database open;
shutdown immediate;
再次startup以archive log模式
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$log;
GROUP# SEQUENCE#
---------- ----------
1 62
3 64
2 63
原来是日志组一的一个日志不能归档
SQL> alter database clear unarchived logfile group 1;
alter database open;
最后，也可以指定位置Arch Log, 请按照如下配置
select name from v$datafile;
alter system set log_archive_dest='/opt/app/oracle/oradata/usagedb/arch' scope=spfile
或者修改大小(我的改成了20G,不能太小了)
SQL> alter system set db_recovery_file_dest_size=3G scope=both;
算法的示例)
 使用总结)
