Database Pre-Installation

Dear All,

Could you please tell me the meaning of the following kernel and why we have to set this kernel?

In Solaris OS.

# vi /etc/system

set noexec_user_stack=1

set semsys:seminfo_semmni=100

set semsys:seminfo_semmns=1024

set semsys:seminfo_semmsl=256

set semsys:seminfo_semvmx=32767

set shmsys:shminfo_shmmax=429967296

set shmsys:shminfo_shmmni=100

set max_nprocs=32767

set maxuprc=16384

            set rlim_fd_max = 65536

In OEL OS.

# vi /etc/sysctl.conf

     kernel.shmmni = 4096

     kernel.shmmax = 34359738368

     kernel.shmall = 1073741824

     kernel.sem = 250 32000 100 128

     fs.aio-max-nr = 1048576

     fs.file-max = 6815744

     net.ipv4.ip_local_port_range = 9000 65500

     net.core.rmem_default = 262144

     net.core.rmem_max = 4194304

     net.core.wmem_default = 262144