这个错误已经网上已经有很多事例了，我自己做个记录。 启动Oracle 11gR2后报错：ORA-00845 rac1:/home/oraclegt; sqlplus / as
这个错误已经网上已经有很多事例了，我自己做个记录。
启动Oracle 11gR2后报错：ORA-00845
rac1:/home/oracle> sqlplus / as sysdba;
SQL*Plus: Release 11.2.0.3.0 Production onTue Feb 14 09:11:41 2012
Copyright (c) 1982, 2011, Oracle. All rights reserved.
Connected to an idle instance.
SQL> startup
ORA-00845: MEMORY_TARGET not supported onthis system
这个错误之前已经处理过，，因为tmpfs的大小MEMORY_TARGET的设置，就会报这种错误。
处理
[root@localhost ~]#umount tmpfs
（这里可能回报busy，重启一下再umount）
[root@localhost ~]# mount -t tmpfs shmfs -o size=1g /dev/shm （不用重启）
[root@localhost ~]# vi /etc/fstab(这里需要重启生效)
tmpfs /dev/shm tmpfs defaults,size=1g 0 0
[root@localhost ~]# df -h
文件系统 容量 已用 可用 已用% 挂载点
/dev/mapper/VolGroup00-LogVol00
18G 15G 2.2G 87% /
/dev/sda1 99M 12M 82M 13% /boot
/dev/hdc 2.9G 2.9G 0 100% /media/RHEL_5.3 i386 DVD
shmfs 1.0G 0 1.0G 0% /dev/shm
[root@localhost ~]# su - oracle
SQL*Plus: Release 11.2.0.1.0 Production on Mon Jun 25 15:00:48 2012
Copyright (c) 1982, 2009, Oracle. All rights reserved.
Connected to an idle instance.
SQL> startup
ORACLE instance started.
Total System Global Area 422670336 bytes
Fixed Size 1336960 bytes
Variable Size 281020800 bytes
Database Buffers 134217728 bytes
Redo Buffers 6094848 bytes
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