今天跟往常一样，登陆PL/SQL，确登陆失败，出现一个错误“ORA-01034”和“ORA-27101”如图：
然后就就通过命令提示符去登陆Oracle，去查看怎么回事，然后问题进一步出现，错误“ORA-03113:通信通道的文件结尾 进程 ID:6320 回话 ID :191 序列号：3”。
问题根源
Oracle出现错误，于是去错误日志里去找问题根源：在 e:\app\kang\diag\rdbms\oracle\oracle\trace\文件夹下找到oracle_ora_6320.trc文件，打开显示错误日志：
Trace filee:\app\kang\diag\rdbms\oracle\oracle\trace\oracle_ora_6320.trc
Oracle Database 11gEnterprise Edition Release 11.2.0.1.0 - 64bit Production
With thePartitioning, OLAP, Data Mining and Real Application Testing options
Windows NT VersionV6.1 Service Pack 1
CPU : 4 - type 8664, 2 PhysicalCores
Process Affinity : 0x0x0000000000000000
Memory (Avail/Total):Ph:2805M/6087M, Ph+PgF:6761M/12173M
Instance name: oracle
Redo thread mountedby this instance: 1
Oracle processnumber: 19
Windows thread id:6320, image: ORACLE.EXE (SHAD)
*** 2014-08-1608:18:55.461
*** SESSIONID:(191.3) 2014-08-16 08:18:55.461
*** CLIENT ID:()2014-08-16 08:18:55.461
*** SERVICE NAME:()2014-08-16 08:18:55.461
*** MODULENAME:(sqlplus.exe) 2014-08-16 08:18:55.461
*** ACTION NAME:()2014-08-16 08:18:55.461
ORA-19815: 警告:db_recovery_file_dest_size 字节 (共 4102029312 字节) 已使用 100.00%, 尚有 0 字节可用。
************************************************************************
You have followingchoices to free up space from recovery area:
1. Consider changingRMAN RETENTION POLICY. If you are using Data Guard,
then consider changing RMAN ARCHIVELOGDELETION POLICY.
2. Back up files totertiary device such as tape using RMAN
BACKUP RECOVERY AREA command.
3. Add disk space andincrease db_recovery_file_dest_size parameter to
reflect the new space.
4. Delete unnecessaryfiles using RMAN DELETE command. If an operating
system command was used to delete files,then use RMAN CROSSCHECK and
DELETE EXPIRED commands.
************************************************************************
ORA-19809:超出了恢复文件数的限制
ORA-19804: 无法回收33961984 字节磁盘空间 (从 4102029312 限制中)
*** 2014-08-1608:18:55.502 4132 krsh.c
ARCH: Error 19809Creating archive log file to'E:\APP\KANG\FLASH_RECOVERY_AREA\ORACLE\ARCHIVELOG\2014_08_16\O1_MF_1_159_%U_.ARC'
*** 2014-08-1608:18:55.502 2747 krsi.c
krsi_dst_fail: dest:1err:19809 force:0 blast:1
DDE: Problem Key 'ORA312' was flood controlled (0x1) (no incident)
ORA-00312: 联机日志 3 线程1: 'E:\APP\KANG\ORADATA\ORACLE\REDO03.LOG'
ORA-16038: 日志 3sequence# 159 无法归档
ORA-19809:超出了恢复文件数的限制
ORA-00312: 联机日志 3 线程1: 'E:\APP\KANG\ORADATA\ORACLE\REDO03.LOG'
*** 2014-08-1608:18:55.565
USER (ospid: 6320):terminating the instance due to error 16038
从这里我们发现了问题的根源：“
ORA-19815: 警告: db_recovery_file_dest_size 字节 (共 4102029312 字节) 已使用100.00%, 尚有 0 字节可用。” 是db_recovery_file_dest_size也叫归档日志空间不足导致的，既然找到问题的根源，那解决起来也就容易了。