What is Oracle RAC? – And how do you license Oracle RAC?

You might be wondering: What is Oracle Real Application Clusters (RAC)? Or, you might be wondering: How to license Oracle RAC?  If so, read this article to learn more about Oracle RAC. In this article, we’ll cover the basics of Oracle RAC, including what it is, how it works, and which types of databases you can use with it. We’ll also cover Oracle RAC Node One.


What is Oracle Real Application Clusters?


When it comes to managing your data, you should consider Oracle Real Application Clusters (ORAC) to help you meet the stringent SLAs you need to fulfill. Traditionally, storage solutions have been a challenge for business organizations, resulting in inadequate performance, low efficiency, and high deployment and operating costs. With Oracle RAC, you can avoid these problems with a single, clustered database. For more information, read the following article.


Oracle RAC can increase performance by ten times, while maintaining high availability. This solution has several key features that you should consider, including: concurrent access to storage, the same set of data files, a communications protocol, and a mechanism for monitoring the node’s status. Unlike traditional database clusters, Oracle RAC can scale up and down as your business demands. However, it is still important to know how much your company’s applications need before implementing a clustered environment.


The OCR includes a set of components called voting disks. They reside on different shared physical disks. Oracle provides redundancy for the voting disk by mirroring it. In the event that one voting disk fails, you can repair, replace, or even remove it without stopping the cluster. In case of failure, you can do this while the cluster is online, and then mirror the database. If your cluster fails, you can always restore your data by using Oracle Clusterware.


Oracle RAC is a high availability solution for Oracle DB. It is comprised of two or more server nodes, clustered together. Each server pool has its own importance, and is configured in a way to make sure that it is available when the other servers fail. However, if a single server fails, Oracle RAC ensures that a new server will be deployed from another server pool or from the Free pool.


What are the Oracle RAC benefits?


Among the many benefits of Oracle RAC is its ability to scale. With multiple instances, the system can grow with a business. Rather than dealing with the issues of single point of failure or bottleneck, RAC allows you to manage multiple instances while maintaining a single database. Unlike some local database management systems, Oracle RAC has no database disconnections. It enables you to work at high speeds without sacrificing information.


As each RAC server accesses the same database, the overall system must be designed to guarantee that all changes are coordinated. This function is referred to as Cache Fusion in Oracle RAC. This feature adds complexity to an otherwise simple single-instance Oracle database. Database automation makes sense with single-instance databases, but clusters require more complicated infrastructure. By automating the process of data maintenance and updating, you can ensure the database runs smoothly at all times.


When there is a crash, Oracle RAC facilitates recovery from such an event. Since it is a node-based system, its downtime is minimal. When one node is affected, another node automatically takes over and connects it to the surviving node. This reduces the downtime of the system and ensures that users stay productive while a fix is applied. In addition to this, Oracle RAC also rolls back DML processes if necessary.


In addition to its scalability, Oracle RAC is a low-cost solution that allows businesses to take advantage of a high-availability foundation. By utilizing Oracle clusterware, single-instance or RAC databases can take advantage of high-availability foundation. It also enables users to take advantage of a clustered pool of capacity. However, there are some disadvantages to using Oracle RAC.


Oracle RAC Node One


The Oracle RAC Node One for real application-clustering extends server virtualization benefits to databases running on physical servers. This new feature helps you virtualize database storage while standardizing your database environment. Additionally, you can easily upgrade to multi-node Oracle RAC database instances without disrupting existing databases. However, the advantages of Oracle RAC are not limited to high availability and reduced cost.


Before you add any nodes, you must first perform online database relocation. Make sure that you set up a server pool for your database services on the converted node. You can do this by using the CRSCTL utility or by configuring your cluster in Oracle Enterprise Manager. To migrate an existing database, you must set up the Oracle home to use the new nodes. The Oracle home must be cluster enabled to use Oracle RAC Node One.


Oracle RAC is a server architecture based on the Oracle Grid Framework. This architecture consists of two separate server clusters, which are connected through a network. Oracle RAC uses the Prophet RAC database framework. Oracle Network Foundation incorporates Oracle Clusterware and Oracle Programmed Capacity Administration. These two technologies work together to effectively share server resources and capacity assets. Oracle RAC is supported by the Oracle Clusterware and Prophet RAC database frameworks.


Using Oracle RAC One Node, you can upgrade applications online to Oracle RAC without any downtime. You can also migrate database instances from one node to another online. The only downtime for application users is the database relocation itself. Once you have completed the upgrade, you can use Oracle Virtualization Manager to upgrade to Oracle RAC. If you are running Oracle RAC, you can migrate to Oracle RAC One Node One with Oracle Virtualization Manager.


You can also choose from a different licensing model depending on the hardware in your application clusters. Multicore processors can provide a significant performance boost, but this isn’t the same as dual-core systems, which divide workloads between two processors. Oracle has changed its licensing model to reflect this, but it is important to remember that the license you choose for a single-core system does not double its performance.


How does Oracle RAC licensing work?


Oracle RAC is licensed as an enterprise edition option for Oracle Database Enterprise Edition. That means that you need to


  • License Oracle RAC with the same quantity and metrics as you have licensed the database license.
  • Oracle RAC is core-based licensed the same as the database.
  • RAC One Node all features except, live online migration is part of the RAC license.


You can read more about how to license Oracle technology products, in the database licensing guide.