Shulou(Shulou.com)06/01 Report--

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.

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.