Kernel Parameters for the Oracle 11g R2 Fusion Applications Database

Configuring the Kernel Parameters according to the requirements of the fusion applications 

To know the kernel parameter which is present in the system user sysctl  command

we have the bellow kernel parameters setting as the default

net.ipv4.ip_forward = 0
net.ipv4.conf.default.rp_filter = 1
net.ipv4.conf.default.accept_source_route = 0
kernel.core_uses_pid = 1
net.ipv4.tcp_syncookies = 1
fs.file-max = 6815744
kernel.msgmni = 2878
kernel.msgmax = 8192
kernel.msgmnb = 65536
kernel.sem = 250 32000 100 142
kernel.shmmni = 4096
kernel.shmall = 1073741824
kernel.shmmax = 4398046511104
kernel.sysrq = 1
net.core.rmem_default = 262144
net.core.rmem_max = 4194304
net.core.wmem_default = 262144
net.core.wmem_max = 1048576
fs.aio-max-nr = 3145728
net.ipv4.ip_local_port_range = 9000 65500
vm.min_free_kbytes = 51200

To edit the kernel parameters vi /etc/sysctl.conf

The recommended Kernel parameters for the Oracle Fusion Applications Database

Refer to the Link  http://docs.oracle.com/cd/E15586_01/fusionapps.1111/e16684/set_up_db_tier.htm#BABGGIGA

fs.file-max = 6815744

kernel.shmall = 2097152
kernel.shmmax = 2147483648
kernel.shmmni = 4096
kernel.sem = 250 32000 100 128
net.core.rmem_default = 4194304
net.core.rmem_max = 4194304
net.core.wmem_default = 262144
net.core.wmem_max = 1048576
net.ipv4.ip_forward = 0
net.ipv4.conf.default.rp_filter = 1
tcp.ipv4.tcp_wmem = 262144 262144 262144
tcp.ipv4.tcp_rmem = 4194304 4194304 4194304
fs.aio-max-nr = 1048576
net.ipv4.ip_local_port_range = 9000 65000

Change the parameters according to your environment 

Changing the kernel parameters according to the requirement set the kernel.Shmmax

as to the half of the Physical ram present in your system 

[root@fahtestdb ~]# sysctl -p
net.ipv4.ip_forward = 0
net.ipv4.conf.default.rp_filter = 1
net.ipv4.conf.default.accept_source_route = 0
kernel.core_uses_pid = 1
net.ipv4.tcp_syncookies = 1
fs.file-max = 6815744
kernel.msgmni = 2878
kernel.msgmax = 8192
kernel.msgmnb = 65536
kernel.sem = 250 32000 100 142
kernel.shmmni = 4096
kernel.shmall = 4294967296
kernel.shmmax = 88046829568
kernel.sysrq = 1
net.core.rmem_default = 262144
net.core.rmem_max = 4194304
net.core.wmem_default = 262144
net.core.wmem_max = 1048576
fs.aio-max-nr = 3145728
net.ipv4.ip_local_port_range = 9000 65500
vm.min_free_kbytes = 51200
net.ipv4.tcp_wmem = 262144 262144 262144
net.ipv4.tcp_rmem = 4194304 4194304 4194304