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安装数据的时候报错：
查看操作系统参数设置：
[root@single1 ~]# vi /etc/sysctl.conf # Kernel sysctl configuration file for Red Hat Linux # # For binary values, 0 is disabled, 1 is enabled. See sysctl(8) and # sysctl.conf(5) for more details. # Controls IP packet forwarding net.ipv4.ip_forward = 0 # Controls source route verification net.ipv4.conf.default.rp_filter = 1 # Do not accept source routing net.ipv4.conf.default.accept_source_route = 0 # Controls the System Request debugging functionality of the kernel kernel.sysrq = 0 # Controls whether core dumps will append the PID to the core filename. # Useful for debugging multi-threaded applications. kernel.core_uses_pid = 1 # Controls the use of TCP syncookies net.ipv4.tcp_syncookies = 1 # Disable netfilter on bridges. net.bridge.bridge-nf-call-ip6tables = 0 net.bridge.bridge-nf-call-iptables = 0 net.bridge.bridge-nf-call-arptables = 0 # Controls the default maxmimum size of a mesage queue kernel.msgmnb = 65536 # Controls the maximum size of a message, in bytes kernel.msgmax = 65536 # Controls the maximum shared segment size, in bytes #kernel.shmmax = 68719476736 <span style="color:#FF0000;">kernel.shmmax = 1871947673</span> # Controls the maximum number of shared memory segments, in pages kernel.shmall = 4294967296 fs.aio-max-nr = 1048576 fs.file-max = 6815744 kernel.shmmni = 4096 kernel.sem = 250 32000 100 128 net.ipv4.ip_local_port_range = 9000 65500 net.core.rmem_default = 262144 net.core.rmem_max = 4194304 net.core.wmem_default = 262144 net.core.wmem_max = 1048576看来是
<span style="color:#FF0000;">kernel.shmmax</span>这个参数的限制。我相同主机上还有一个数据库：
SQL> show parameter sga NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ lock_sga boolean FALSE pre_page_sga boolean FALSE sga_max_size big integer 396M sga_target big integer 0
也就是说，单个数据库的sga只要不大于该限制即可。
那么还一种方案，修改操作系统限制：
# Controls the maximum shared segment size, in bytes kernel.shmmax = 68719476736当然，不要忘记
sysctl -p
重新dbca即可。（如果不重新dbca，还是会报错）
Oracle安装报错：SGA size can not be greater than maximum shared memeory segment size
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原文地址：http://blog.csdn.net/ghostliming/article/details/50522537
