oracle11g安装过程提示swap size 检查失败问题
场景描述：我在自己电脑的虚拟机上linux环境下安装oracle11g数据库。
Linux版本为：CentOS release 6.8 (Final)，Oracle版本为：linux.x64_11gR2
问题描述：在oracle安装到Prerequisite Checks这一步的时候，出现两个问题。一个是swap size检查失败，一个是Packages检查失败。关于Packages依赖包检查失败的问题将在下一篇博客进行细述。
错误截图
由错误截图可知，oracle在安装过程中进行检查系统环境的时候，关于swap（交换分区）的大小预期为3.74G，而系统实际上只有1.94G。
因此我们需要增加大约2G的系统swap才符合oracle的要求。
-----------------------百度百科关于 swap的解释----------------------------------------
swap：Linux中Swap（即：交换分区），类似于Windows的虚拟内存，就是当内存不足的时候，把一部分硬盘空间虚拟成内存使用,从而解决内存容量不足的情况。Android是基于Linux的操作系统，所以也可以使用Swap分区来提升系统运行效率。
交换分区，英文的说法是swap，意思是“交换”、“实物交易”。它的功能就是在内存不够的情况下，操作系统先把内存中暂时不用的数据，存到硬盘的交换空间，腾出内存来让别的程序运行，和Windows的虚拟内存（pagefile.sys）的作用是一样的。
----------------------------------------------------------------------------------------------------
解决办法：增加大约2G左右的swap！
步骤如下：
设置完成后，在oracle安装界面点击check again，错误提示消失。1、使用root用户，在/tmp（随意），下执行下面语句
dd if=/dev/zero of=swapfree bs=32k count=65515(增加swap大小为bs*count，bs为block，count为数量)
上图可以看出，通过这个语句创建了一个2G的文件swapfree
2、将创建的文件用做交换分区
执行语句：mkswap swapfree
3、开启这个交换空间
执行语句：swapon swapfree
4、通过free命令查看，交换空间在原来交换空间的基础上增加了2G
5、在/etc/fstab中加入下面两行，设置此交换分区开机启动/dec/hdb5 swap swap defaults 0 0/tmp/swapfree swap swap defaults 0 0
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oracle安装时，条件检查不通过解决办法
09-22 阅读数 360
oracle安装时，条件检查不通过解决办法1.开始菜单→运行：输入regedit，打开注册表2.依次点开HKEY_LOCAL_MACHINE>>SYSTEM>>CurrenControlSet>>se... 博文 来自： young_farmers的博客
oracle11g安装后创建数据库提示问题
01-08 阅读数 44
oracle使用databasecontrol配置数据库时，要求在当前oracle主目录中配置监听程序，必须运行Netca以配置oracle是这样的：监听与数据库的服务是分开的，是单独的一个Sessi... 博文 来自： bca65432123的博客
Oracle11g 64位安装教程以及安装过程中可能遇到的问题
03-30 阅读数 7042
1、安装准备2、开始安装3.检查是否安装成功。4.安装过程中可能遇到的问题1、安装准备下载官网的oracle安装程序，有两个压缩包。选中这两个压缩包，点击解压到当前文件夹，两个压缩包同时解压成一个名叫... 博文 来自： MayanDev
Oracle11g 安装时出现先决条件检查失败解决办法
04-14 阅读数 1419
安装Oracle11gR2时出现先决条件检查失败的详细解决处理过程：在运行中（或键盘按Win+R）输入regedit打开注册表，找到HKEY_LOCAL_MACHINE\SYSTEM\CurrentC... 博文 来自： 好记性不如烂笔头
win7系统安装oracle11g过程中出现的问题及解决方案
03-23 阅读数 736
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关于安装oracle 11g client 出现安装先决条件检查全部失败
04-24 阅读数 1万+
今天我在安装Oracle11gClient时，全部显示成N/A，Oracle无法执行任何检查，错误提示类似下面的样子：物理内存–此先决条件将测试系统物理内存总量是否至少为922MB(944128.0K... 博文 来自： iloli的专栏
安装oracle 11g过程中，prerequisite checks过程中各种failed问题解决
04-12 阅读数 8518
问题一：Packages报错yum环境配置好后，就可以运行yum install packagename命令进行包的安装 yum install compat-libstdc++-33 elfutil... 博文 来自： X-X-羊的专栏
oracle 11g 安装关于swap空间不足问题解决
03-19 阅读数 3945
linux添加虚拟内存解决swap空间不足问题增加一个SWAP文件：1.查看当前虚拟内存[root@ora11gr2~]#free-m total used free share... 博文
centos 安装oracle 报Checking swap space: 0 MB available, 150 MB required. Failed
06-11 阅读数 3420
RF:https://www.cnblogs.com/a9999/p/6957280.html1系统环境centos6.5oracle11g 内存16G硬盘ssd250G2运行安装命令：[oracle... 博文 来自： D的博客
修改linux swap交换区大小
03-14 阅读数 715
swap交换区是linux的虚拟内存技术，为了有效的提高物理内存的利用率，会在硬盘开辟一块空间用处堆放不经常使用的内存数据。而有时候虚拟内存满了会导致部分程序卡死（虽然不至于系统崩溃。）##修改交换区... 博文 来自： 度窝-笔记
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Oracle 10g 安装 “Checking swap space” Failed
09-04
我在（XP）安装Oracle 10g的时候出现了这样的错误提示： Checking swap space：0 MB available， 1535 MB required. Failed <<<< 对 论坛
centos7安装oracle12c
05-11 阅读数 1万+
本文基本参考了下面这篇文章http://blog.youkuaiyun.com/gq5251/article/details/42004035但是改正了一些错误操作系统:CentOSLinuxrelease7.2... 博文 来自： 程序员小董的专栏
oracle11g安装时内核参数设置
04-20 阅读数 453
net.ipv4.ip_forward=0net.ipv4.conf.default.rp_filter=1net.ipv4.conf.default.accept_source_route=0ker... 博文 来自： xo_zhang的专栏
CentOS7安装Oracle 11gR2 图文详解 2
04-26 阅读数 306
5.选择单例安装，前面的所有配置均为单例安装。6.添加语言7.默认安装版本企业版-EnterpriseEdition--图没了。8.确定数据软件的安装路径，自动读取前面Oracle环境变量中配置的值。... 博文 来自： qq_34618853的博客
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关于ORACLE数据库服务器SWAP该设置成多大的建议值
12-28 阅读数 2452
有经验的系统管理员和DBA，往往会给系统建设一个适中大小的SWAP大小，但实际生产系统中，也经常发现有一些，因为SWAP设置过小的原因，而导致物理内存、SWAP全部耗尽，导致DOWN机的情况；也有发现... 博文 来自： 黎俊杰 的DBA生涯
CENTOS: 增加SWAP的大小
04-03 阅读数 3633
第一步：关闭SWAPsudoswapoff-a第二步：把当前的SWAP文件增大sudoddif=/dev/zeroof=/swapfilebs=1Mcount=1024bs指的是BlockSize，就... 博文 来自： dogfish的专栏
Oracle 11.2.0.2 安装条件检查之pdksh 包
06-30 阅读数 3964
本文的原址：http://blog.itpub.net/21162451/viewspace-721930/ 其实这个包可以忽略，我在redhead6.XCentos6.xoracleLinux6.x... 博文 来自： 孔老先生的博客
Oracle11g安装过程遇到的问题
10-17 阅读数 61
Oracle11g安装成功后，在DOS窗口输入emctlstatusdbconsole命令，提示EnvironmentvariableORACLE_UNQNAMEnotdefined.Pleasese... 博文 来自： 程序员的天堂
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01-10 阅读数 1041
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RedHat7调整swap大小
02-20 阅读数 236
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