关于AIX上裸设备表空间管理
Oracle作为一个应用广泛的数据库，而又以其在AIX上库运行较稳定，在一些应用比较关键的部门和行业有着广泛的应用。裸设备作为一个
Oracle作为一个应用广泛的数据库，而又以其在AIX上库运行较稳定，在一些应用比较关键的部门和行业有着广泛的应用。裸设备作为一个特殊的数据存储介质，它可以直接操作数据，省去了操作系统一级别，速度更加迅速。虽然11g开始oracle对裸设备的支持越来越小，但是相信裸设备在数据库的管理还是相当广泛。
1、查看活动卷组
2、查看卷组空间
可以看到每个pp size512MB，还有free pp1062块。
3、创建逻辑卷
创建一个逻辑卷，可以指定大小或pp数目。
4、查看卷组下拥有的逻辑卷
逻辑卷有open和closed，其中open是指使用的，closed是未使用的。如果要删除逻辑卷，，必须先将它上面的表空间删除才可。
5、修改卷组属性
我们刚刚建立了一个nagios的逻辑卷，它也是一个设备块。
我们首先需要了解两个概念。
块：以b开头。随机存取的设备，在访问时使用缓存技术，实现按块的数据访问。典型的是硬盘上的文件系统。
字符设备：以c开头。使用顺序写入的、面向流的设备类型，在访问过程中不采用缓冲区方法优化。典型的是裸设备。
我们建立的/dev/nagios是块设备，/dev/rnagios即为对应的字符设备。
Chown -R oracle：dba /dev/rnagios
6、创建表空间
Sql>conn /as sysdba
Sql>create tablespace nagios datafile ‘/dev/rnagios’ size 45m;
这里的size要略小于裸设备本身的容量。
然后指定使用表空间的用户即可，在这个用户建立的数据便可以使用该裸设备空间。
顺便提一下如果是rac环境，这里建立的表空间很难达到数据同步重启节点，这个可以看我的《RAC环境数据库重启实例》大家分享 。
相关阅读：
VMware上安装Oracle 10g RAC-ASM+裸设备
AIX上用裸设备安装Oracle
Oracle for AIX基于裸设备的表空间扩充步聚
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