shm /dev/shm tmpfs defaults,size=500M 0 0
把上面的这句写到/etc/fstab中 ,然后mount /dev/shm
oracle中应该修改这些参数memory_max_target = 500M scope=spfile;sga_max_size=500M scope=spfile;memory_target=500m;sga_target=0;pga_aggregate_target=0