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.

班玛ssl适用于网站、小程序/APP、API接口等需要进行数据传输应用场景，ssl证书未来市场广阔！成为创新互联的ssl证书销售渠道，可以享受市场价格4-6折优惠！如果有意向欢迎电话联系或者加微信：18980820575（备注：SSL证书合作）期待与您的合作！

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.

另外有需要云服务器可以了解下创新互联scvps.cn，海内外云服务器15元起步，三天无理由+7*72小时售后在线，公司持有idc许可证，提供“云服务器、裸金属服务器、高防服务器、香港服务器、美国服务器、虚拟主机、免备案服务器”等云主机租用服务以及企业上云的综合解决方案，具有“安全稳定、简单易用、服务可用性高、性价比高”等特点与优势，专为企业上云打造定制，能够满足用户丰富、多元化的应用场景需求。

分享名称：OracleRACPrinciple1-创新互联
本文地址：http://sczitong.cn/article/ccjigs.html