CentOS上Oracle 11gR2创建数据库

1. tmpfs配置

tmpfs默认为内存的一半，如果CentOS上只装了Oracle做数据库服务器使用，想要设置Oracle AMM利用80%~90%的内存，必须将tmpfs的设置改大。

本例中使用虚拟机为1024M内存，此处更改/etc/fstab设置文件，设置tmpfs大小为896M

[root@localhost ~]# vim /etc/fstab

#
# /etc/fstab
# Created by anaconda on Tue Oct  2 00:56:54 2012
#
# 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
#
/dev/mapper/VolGroup-lv_root /                       ext4    defaults        1 1
UUID=c82b7a71-352a-448d-ab80-4b38ecfc119d /boot                   ext4    defaults        1 2
/dev/mapper/VolGroup-lv_swap swap                    swap    defaults        0 0
tmpfs                   /dev/shm                tmpfs   defaults,size=896M        0 0
devpts                  /dev/pts                devpts  gid=5,mode=620  0 0
sysfs                   /sys                    sysfs   defaults        0 0
proc                    /proc                   proc    defaults        0 0

重新mount并查看更改后的结果

[root@localhost ~]# mount -o remount,size=896M /dev/shm
[root@localhost ~]# df -m
Filesystem           1M-blocks      Used Available Use% Mounted on
/dev/mapper/VolGroup-lv_root
                         17552     10352      6310  63% /
tmpfs                      896         1       896   1% /dev/shm
/dev/sda1                  485        51       409  12% /boot
/dev/sr0                  3542      3542         0 100% /media/CentOS_6.3_Final

注：发现即使更改了/etc/fstab文件的配置，重启后tmpfs仍回还原到内存的一半（网上查询为CentOS 6的Bug），所以我们要在/etc/rc.local文件中手动加入remount命令

[root@localhost ~]# vim /etc/rc.local
#!/bin/sh
#
# This script will be executed *after* all the other init scripts.
# You can put your own initialization stuff in here if you don't
# want to do the full Sys V style init stuff.

touch /var/lock/subsys/local
mount -o remount,size=896M /dev/shm