通常这个异常都是空间满导致，查询alter_orcl.log 这个文件一般都能看到错误信息，其中orcl为数据库的sid。
一般都会有类似的日志：
ORA-19815: WARNING: db_recovery_file_dest_size of 5218762752 bytes is 100.00% used, and has 0 remaining bytes available.
You have following choices to free up space from recovery area:
- Consider changing RMAN RETENTION POLICY. If you are using Data Guard,
then consider changing RMAN ARCHIVELOG DELETION POLICY. - Back up files to tertiary device such as tape using RMAN
BACKUP RECOVERY AREA command. - Add disk space and increase db_recovery_file_dest_size parameter to
reflect the new space. - Delete unnecessary files using RMAN DELETE command. If an operating
system command was used to delete files, then use RMAN CROSSCHECK and
DELETE EXPIRED commands.
这里选择4进行处理。
切换到oracle用户执行：
su - oracle
[oracle@db~]$ sqlplus /nolog
SQL*Plus: Release 11.2.0.1.0 Production on Thu Jun 23 17:44:00 2016
Copyright (c) 1982, 2009, Oracle. All rights reserved.
sql> conn / as sysdba
Connected to an idle instance.
sql> startup nomount
ORACLE instance started.
再执行
sql> alter database mount;
Database altered.
接下来就需求清理空间了
另外起一个终端，找到文件存放路径：
[oracle@db~]$ cd /data2/oracle/flash_recovery_area/ORCL/archivelog/
[oracle@db archivelog]$ pwd
/data2/oracle/flash_recovery_area/ORCL/archivelog
[oracle@db archivelog]$ ls
2016_06_01 2016_06_02 2016_06_03 2016_06_04 2016_06_05 2016_06_06 2016_06_07 2016_06_08 2016_06_21 2016_06_22 2016_06_23
[oracle@db archivelog]$ rm -rf 2016_05*
删除掉不要的文件。
接下来需要启动rman了
[oracle@db archivelog]$ rman target /
Recovery Manager: Release 11.2.0.1.0 - Production on Thu Jun 23 17:49:55 2016
Copyright (c) 1982, 2009, Oracle and/or its affiliates. All rights reserved.
connected to target database: ORCL (DBID=1412518558)
RMAN> crosscheck archivelog all;
一堆的提示不管它，再执行：
RMAN> delete expired archivelog all;
删除掉过期的归档文件。
接下来回到刚才的sqlplus终端，执行如下：
SQL> alter database open;
Database altered.
SQL>
好了，数据库起来了。
然后启动监听端口就万事大吉了。
如果磁盘空间没有满，想增加闪回恢复区。
在mount数据库后，执行：
alter system set db_recovery_file_dest_size=8G;
修改的过程如下：
<pre>
[oracle@db~]$ sqlplus /nolog
SQL*Plus: Release 11.2.0.1.0 Production on Fri Jun 24 10:56:40 2016
Copyright (c) 1982, 2009, Oracle. All rights reserved.
SQL> conn /as sydba
SP2-0306: Invalid option.
Usage: CONN[ECT] [{logon|/|proxy} [AS {SYSDBA|SYSOPER|SYSASM}] [edition=value]]
where <logon> ::= <username>[/<password>][@<connect_identifier>]
<proxy> ::= <proxyuser>[<username>][/<password>][@<connect_identifier>]
SQL> exit
[oracle@firebox42 ~]$ sqlplus /nolog
SQL*Plus: Release 11.2.0.1.0 Production on Fri Jun 24 10:57:02 2016
Copyright (c) 1982, 2009, Oracle. All rights reserved.
SQL> conn /as sysdba
Connected to an idle instance.
SQL> startup nomount
ORA-01012: not logged on
SQL> shutdown abort
ORACLE instance shut down.
SQL> startup nomount
ORACLE instance started.
Total System Global Area 1.0689E+10 bytes
Fixed Size 2216344 bytes
Variable Size 6845107816 bytes
Database Buffers 3825205248 bytes
Redo Buffers 16945152 bytes
SQL> alter database mount;
Database altered.
SQL> show parameter db_recover;
NAME TYPE VALUE
db_recovery_file_dest string /opt/oracle/flash_recovery_are
a
db_recovery_file_dest_size big integer 3882M
SQL> alter system set db_recovery_file_dest_size=80G;
System altered.
SQL> alter database open;
Database altered.
</pre>
