OracleRACPrinciple1-创新互联
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.
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。
新闻标题：OracleRACPrinciple1-创新互联
网页URL：http://cdiso.cn/article/ccjigs.html
