OracleRACPrinciple1

Describe principle~
The real application clusters database highly available and extensible.Failure of one node in the cluster does not affect customer usage until the last node in cluster fails.
Defects~
The high cost.Each node has a separate oracle license and also needs a rac license.
The high speed interconnection requirements make the nodes close together, which means that a natural disaster may destroy the whole cluster.

成都创新互联公司主要从事网页设计、PC网站建设（电脑版网站建设）、wap网站建设（手机版网站建设）、成都响应式网站建设公司、程序开发、网站优化、微网站、微信平台小程序开发等，凭借多年来在互联网的打拼，我们在互联网网站建设行业积累了丰富的成都网站制作、成都网站设计、网站设计、网络营销经验，集策划、开发、设计、营销、管理等多方位专业化运作于一体。

The heardware configuration：
For RAC database,include two or more nodes. Redundant power supply,network card,dual CPU and error correction memory.
Shared disks should also have built-in hardware redundancy -multiple power supplies,raid-enabled disks,and so on.

The software configuration:
Cluster Ready Service,CRS

The network configuration:
Each node in RAC has at least three IP addresses.
Public network:All normal connections between the node and the server.
Private network:Intra-cluster node communication.
Virtual IP:Listen for addresses,and support rapid connect-time failover.
Public and private networks are best bond,providing redundancy and bandwidth.

Summary:This blog birefly describes RAC.
NOTE:The next blog will describe the RAC process.

文章标题：OracleRACPrinciple1
本文URL：http://6mz.cn/article/jjehjh.html