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What is Oracle RAC cluster?
Oracle Real Application Clusters (RAC) allow customers to run a single Oracle Database across multiple servers in order to maximize availability and enable horizontal scalability, while accessing shared storage.
How does RAC cluster work?
Is Oracle RAC still used?
Oracle Real Application Clusters (RAC), introduced with Oracle 9i in 2001, supersedes the Oracle Parallel Server (OPS) database option. You can still use clusterware from other vendors, if the clusterware is certified for Oracle RAC.
What is the difference between Oracle RAC and Exadata?
Oracle Exadata is a pre-configured combination of hardware and software that provides an infrastructure for running Oracle Database. The database layer consists of Sun servers and runs Oracle 11gR2 software and normally Oracle RAC is deployed on database node. The database layer uses ASM to map to the storage layer.
How can I find my private IP in Oracle RAC?
Checking Oracle RAC Network and IPs information
- Display the current scan configuration. $ srvctl config scan. SCAN name: exadata-pscan1, Network: 1. Subnet IPv4: 192.168.16.0 /255 .255.255.0 /bondeth0 , static.
- Obtain information about SCAN DNS records. $ nslookup exadata-pscan1. Server: 192.168.16.20.
- Display Cluster Name.
How does RAC work Oracle?
Oracle Real Application Clusters (RAC) provides a database environment that is highly available as well as scalable. If a server in the cluster fails, the database instance will continue to run on the remaining servers or nodes in the cluster. With Oracle Clusterware, implementing a new cluster node is made simple.
How does RAC work in an Oracle Cluster?
RAC enables each computer, or node, that is a member of a cluster database to share access to the Oracle database. If one cluster node fails or is taken offline, then the other cluster nodes continue operating and the entire RAC database remains available.
What are the components of a RAC database?
A RAC database requires three components: cluster nodes, shared storage, and Oracle Clusterware. Although you can choose how many nodes your cluster should have and what type of shared storage to use, this appendix is based on one specific configuration, which is the recommended configuration for two-computer, or two-node, clusters.
What is a target in a cluster database?
On the Cluster Database Page, a target can be a cluster, a database instance, or an Oracle utility, such as a listener. The console obtains metrics that provide information about the current states of the targets. The Cluster Database page displays these metrics in separate section headings for each target.
How to check the performance of a cluster?
Access the Cluster Performance page by clicking the Cluster link in the General section of the Cluster Database Performance page, then click the Performance tab from the Cluster Home page. With these statistics, you can determine whether resources need to be added, suspended, or re-distributed.