数据库安装完成后，必改系统参数之一

一、环境

Oracle 11.2.0.4

Rhel 6.6

二、修改tmpfs

数据库安装完成之后，需要修改很多参数，包括数据库参数和系统参数，操作系统必须修改参数之一。

按照操作系统60%到80%进行改动。

[root@roidb01 ~]# df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/sda3        36G   17G   18G  49% /
tmpfs           2.0G  235M  1.8G  12% /dev/shm
/dev/sda1       190M   32M  149M  18% /boot
[root@roidb01 ~]# free -m
             total       used       free     shared    buffers     cached
Mem:          3959       1253       2706        238         28        857
-/+ buffers/cache:        367       3592
Swap:         4095          0       4095
[root@roidb01 ~]#
[root@roidb01 ~]#
[root@roidb01 ~]#
[root@roidb01 ~]# vi /etc/fstab

#
# /etc/fstab
# Created by anaconda on Fri Sep 15 15:36:11 2017
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
UUID=c554e888-d7c8-4954-9cde-51638abe23b7 /                       ext4    defaults        1 1
UUID=73078377-c31b-4bd8-8bd6-652fae65a5b8 /boot                   ext4    defaults        1 2
UUID=766af6f8-99a2-4915-9f64-b8e96fbb4404 swap                    swap    defaults        0 0
tmpfs                   /dev/shm         tmpfs   defaults,size=3000m    0 0
devpts                  /dev/pts                devpts  gid=5,mode=620  0 0
sysfs                   /sys                    sysfs   defaults        0 0
proc                    /proc                   proc    defaults        0 0
~                                                                                                                                    
~                                                                                                                                    
                                     
~                                                                                                                                    
"/etc/fstab" 15L, 805C written
[root@roidb01 ~]# mount -o remount /dev/shm
[root@roidb01 ~]# df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/sda3        36G   17G   18G  49% /
tmpfs           3.0G  236M  2.7G   8% /dev/shm
/dev/sda1       190M   32M  149M  18% /boot
[root@roidb01 ~]#