4、Oracle 数据库 startup 报错：ORA-27102: out of memory

1、数据库启动报错： ORA-: out of memory
SQL> startup pfile='/db/oracle/init.ora';
ORA-: out of memory
Linux-x86_64 Error: : No space left on device
Additional information: -
Additional information: 

、内存不足？查看操作系统内存：
$ free -h
             total       used       free     shared    buffers     cached
Mem:          252G        23G       228G       441M       389M        18G
-/+ buffers/cache:       .5G       247G
Swap:          63G         0B        63G 

free:剩余228G，不应该啊。

第一反应什么参数有问题？
sga_max_target=80G
sga_target=70G
没毛病。。。

、查看操作系统参数：
cat /etc/sysctl.conf
#kernel.shmall =
#kernel.shmmni =
#kernel.sem =
#net.ipv4.ip_local_port_range =
#net.core.wmem_default =
#net.core.rmem_default =
#net.core.rmem_max =
#net.core.wmem_max =
#fs.aio-max-nr =
#kernel.shmall =
#kernel.shmall =
#fs.aio-max-nr =
#fs.file-max =
#kernel.shmall =
#kernel.shmmax =
#kernel.shmmni =
#kernel.sem =
#net.ipv4.ip_local_port_range =
#net.core.rmem_default =
#net.core.rmem_max =
#net.core.wmem_default =
#net.core.wmem_max =
#net.ipv4.ipfrag_high_thresh =
#net.ipv4.ipfrag_low_thresh = 15728640

kernel.shmall 发现写了四次，而生效的参数是 kernel.shmall = 2097152
删掉重复的参数，保留 kernel.shmall = 4294967296 ，sysctl -p  使参数生效。

重启数据库解决！