一.DB2简介IBM公司研制的一种关系型数据库系统。DB2主要应用于大型应用系统，具有较好的可伸缩性，可支持从大型机到单用户环境，应用于OS/2、Windows等平台下。D
一.DB2简介
IBM公司研制的一种关系型数据库系统。DB2主要应用于大型应用系统，具有较好的可伸缩性，可支持从大型机到单用户环境，应用于OS/2、Windows等平台下。 DB2提供了高层次的数据利用性、完整性、安全性、可恢复性，以及小规模到大规模应用程序的执行能力，具有与平台无关的基本功能和SQL命令。DB2采用了数据分级技术，能够使大型机数据很方便地下载到LAN数据库服务器，使得客户机/服务器用户和基于LAN的应用程序可以访问大型机数据，并使数据库本地化及远程连接透明化。 它以拥有一个非常完备的查询优化器而著称，其外部连接改善了查询性能，并支持多任务并行查询。 DB2具有很好的网络支持能力，每个子系统可以连接十几万个分布式用户，可同时激活上千个活动线程，对大型分布式应用系统尤为适用。
顺便说一下，DB2在互联网公司用的可真不多，但是在银行，保险等企业用的很多，之前没有接触过，现在要做DB2的监控，所以就顺便学习了下安装配置，所以我下面的这个教程会从0开始，希望有一天你要安装DB2的时候能助你一臂之力。
二.安装配置
1.下载数据库
这个当然是去IBM的官网下载了，所以地址在这里就不写了，自己谷歌去，如果下载需要你要账号，那么自个注册个就行了。软件包大小在400-900M之间吧，什么32bit，X86_64，对应的版本自己选择，不说了。
2.系统环境
说一下我的系统环境，，rhel6.3X86_64，所以我下载的是64位tar.gz包。
安装依赖的软件包
yum install ksh libstdc++ compat-libstdc* pam libaio
开始了，解压，
进入目录安装
这里说一下几个命令的作用
db2_install 命令行向导安装 db2setup 图形化向导安装 de2_deinstall 卸载
输入yes，输入SERVER，输入no，三步搞定，慢慢等吧，时间长短看你的机器性能，估计最少也得5-10分钟吧
安装后的目录为/opt/ibm/db2/V10.5/
安装成功
创建实例。这里特别的说明一下，一定要用一个新用户去创建实例
shell#useradd sjcdb2 shell#echo 'itniaho'|passwd --stdin sjcdb2
切换到sjcdb2用户
设置运行模式为tcp，端口为50000
通信协议 /opt/ibm/db2/V10.5/adm/db2set DB2COMM=tcpip 监听端口 db2 update dbm cfg using svcename 50000安装配置使用到此结束，后面大家自己慢慢研究。
监控部分空了再写先收工下班了。
2013-10-29 itnihao记录。
参考文档
本文出自 “itnihao的运维技术博客” 博客，请务必保留此出处
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