Oracle 10g is easy to use with high performance. Design and build databases with Oracle reliable technology. Oracle 10g Free Download Latest version setup. Dynamic provisioning of nodes, storage, CPUs, and memory allow service levels to be easily and. RAC is technology that can harness these components into useful processing system for the enterprise. RAC also enables enterprise Grids that are built out of large configurations of standardized, commodity-priced components: processors, servers, network, and storage. In a RAC environment Oracle runs on two or more systems in a cluster while concurrently accessing a single shared database ( Figure 4). Oracle Real Application Clusters (RAC) enables the enterprise to build database servers across multiple systems that are highly available and highly scalable. Clients of a highly available data service expect the network address and host name of the data service to remain the same, and expect to be able to make requests in the same way, regardless of which machine the data service is on.
Even though highly available data services can be very different in nature, they have some common requirements. The cluster should be able to survive any single point of failure. All of the parts in the cluster should be redundant, including the machines themselves. One of the benefits of an HA cluster is that a data service can recover without the aid of support staff, and it can do so at any time. If a failover occurs, the data service, along with its logical network interfaces and set of disks, are moved to another machine (IBM, 2006). The clients of an HA data service connect via TCP/IP to the logical network interfaces of the data service only.
A data service running on an HA cluster has one or more logical public network interfaces and a set of disks associated with it. The disks in an HA cluster are connected to two or more machines in the cluster, so that if one machine fails, another machine has access to them. The public network interfaces are used to communicate directly with clients of the HA cluster. private network interfaces are used to send heartbeat messages, as well as control messages, among the machines in the cluster.
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