Oracle11g的Linux版本在修改了MEMORY_TARGET或者SGA_TARGET后启动可能会报错：

SQL> shutdown immediate

Database closed.

Database dismounted.

ORACLE instance shut down.

SQL> startup

ORA-00845: MEMORY_TARGET not supported on this system

这个问题是由于设置SGA的大小超过了操作系统/dev/shm的大小：

[root@enterprice64 ~]# df -k /dev/shm

Filesystem 1K-blocks Used Available Use% Mounted on

tmpfs 4089416 0 4089416 0% /dev/shm

Oracle在metalink的文档：Doc ID:Note:460506.1中进行了说明。解决这个问题只有两个方法，一种是修改初始化参数，使得初始化参数中SGA的设置小于/dev/shm的大小，另一种方法就是调整/dev/shm的大小。

修改/dev/shm的大小可以通过修改/etc/fstab来实现：

[root@enterprice64 ~]# vi /etc/fstab

LABEL=/ / ext3 defaults 1 1

LABEL=/boot /boot ext3 defaults 1 2

LABEL=/data /data ext3 defaults 1 2

devpts /dev/pts devpts gid=5,mode=620 0 0

#tmpfs /dev/shm tmpfs defaults 0 0

tmpfs /dev/shm tmpfs defaults,size=10240M 0 0

LABEL=/home /home ext3 defaults 1 2

LABEL=/opt /opt ext3 defaults 1 2

proc /proc proc defaults 0 0

sysfs /sys sysfs defaults 0 0

LABEL=/usr /usr ext3 defaults 1 2

LABEL=/var /var ext3 defaults 1 2

LABEL=SWAP-sda8 swap swap defaults 0 0

~

~

"/etc/fstab" 13L, 965C written

[root@enterprice64 ~]# umount /dev/shm

[root@enterprice64 ~]# mount /dev/shm

[root@enterprice64 ~]# df -k /dev/shm

Filesystem 1K-blocks Used Available Use% Mounted on

tmpfs 10485760 0 10485760 0% /dev/shm

[root@enterprice64 ~]# su - oracle

[oracle@enterprice64 ~]$ sqlplus "/ assysDBA"

SQL*Plus: Release 11.1.0.6.0 - Production on Tue Oct 2315:42:42 2007

Copyright (c) 1982, 2007, Oracle. All rights reserved.

Connected to an idle instance.

SQL> startup

ORACLE instance started.

Total System Global Area 4743446528 bytes

Fixed Size 2143824 bytes

Variable Size 3892316592 bytes

Database Buffers 805306368 bytes

Redo Buffers 43679744 bytes

Database mounted.

Database opened.

修改/etc/fstab，重新mount /dev/shm，然后就可以启动数据库了。