{"id":196749,"date":"2025-08-12T06:58:00","date_gmt":"2025-08-12T05:58:00","guid":{"rendered":"https:\/\/datascientest.com\/en\/?p=196749"},"modified":"2025-08-06T12:58:30","modified_gmt":"2025-08-06T11:58:30","slug":"all-aboutoracle-rac","status":"publish","type":"post","link":"https:\/\/datascientest.com\/en\/all-aboutoracle-rac","title":{"rendered":"What is Oracle RAC (Real Application Clusters)?"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"196749\" class=\"elementor elementor-196749\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-a176490 e-flex e-con-boxed e-con\" data-id=\"a176490\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-79df03c elementor-widget elementor-widget-text-editor\" data-id=\"79df03c\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor - v3.15.0 - 02-08-2023 *\/\n.elementor-widget-text-editor.elementor-drop-cap-view-stacked .elementor-drop-cap{background-color:#69727d;color:#fff}.elementor-widget-text-editor.elementor-drop-cap-view-framed .elementor-drop-cap{color:#69727d;border:3px solid;background-color:transparent}.elementor-widget-text-editor:not(.elementor-drop-cap-view-default) .elementor-drop-cap{margin-top:8px}.elementor-widget-text-editor:not(.elementor-drop-cap-view-default) .elementor-drop-cap-letter{width:1em;height:1em}.elementor-widget-text-editor .elementor-drop-cap{float:left;text-align:center;line-height:1;font-size:50px}.elementor-widget-text-editor .elementor-drop-cap-letter{display:inline-block}<\/style>\t\t\t\t<p><b>Oracle RAC is a technology designed to ensure continuity of services even when infrastructures fail. Discover how it works, its advantages, and why it remains one of the most reliable solutions on the market for critical systems!<\/b><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e7b4bc7 elementor-widget elementor-widget-text-editor\" data-id=\"e7b4bc7\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p><b>Zero downtime<\/b><span style=\"font-weight: 400;\">. It&#8217;s the promise every company dreams of making, especially when its data powers real-time operations. But between <\/span><b>network outages<\/b><span style=\"font-weight: 400;\">, <\/span><b>server crashes<\/b><span style=\"font-weight: 400;\">, and <\/span><b>load spikes<\/b><span style=\"font-weight: 400;\">, reality is often less than ideal.<\/span><\/p><p><span style=\"font-weight: 400;\">Fortunately, as far back as 2001, Oracle introduced a powerful technological asset: <\/span><b>RAC, or Real Application Clusters<\/b><span style=\"font-weight: 400;\">. This distributed database system is designed to absorb shocks, intelligently distribute the load, and ensure <\/span><b>virtually uninterrupted availability<\/b><span style=\"font-weight: 400;\">\u2026<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-de1f2e9 e-flex e-con-boxed e-con\" data-id=\"de1f2e9\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-fe7a5ea elementor-widget elementor-widget-heading\" data-id=\"fe7a5ea\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor - v3.15.0 - 02-08-2023 *\/\n.elementor-heading-title{padding:0;margin:0;line-height:1}.elementor-widget-heading .elementor-heading-title[class*=elementor-size-]>a{color:inherit;font-size:inherit;line-height:inherit}.elementor-widget-heading .elementor-heading-title.elementor-size-small{font-size:15px}.elementor-widget-heading .elementor-heading-title.elementor-size-medium{font-size:19px}.elementor-widget-heading .elementor-heading-title.elementor-size-large{font-size:29px}.elementor-widget-heading .elementor-heading-title.elementor-size-xl{font-size:39px}.elementor-widget-heading .elementor-heading-title.elementor-size-xxl{font-size:59px}<\/style><h2 class=\"elementor-heading-title elementor-size-xl\">What exactly is Oracle RAC?<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-13fd9a6 elementor-widget elementor-widget-text-editor\" data-id=\"13fd9a6\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">Rather than operating the Oracle Database on a single server (known as an <\/span><b>Oracle instance<\/b><span style=\"font-weight: 400;\">), RAC allows it to run simultaneously on <\/span><b>multiple physical servers connected to shared storage<\/b><span style=\"font-weight: 400;\">.<\/span><\/p><p><span style=\"font-weight: 400;\">Each server in the cluster operates its own Oracle instance, yet all access the same database. So, if one server fails, the others seamlessly take over <\/span><b>without interruption to service<\/b><span style=\"font-weight: 400;\">. Even better: the workload can be dynamically distributed among the servers, enhancing overall performance.<\/span><\/p><p><span style=\"font-weight: 400;\">Oracle RAC can thus transform a single database into a distributed, fault-tolerant, and highly scalable system, all without the end-users noticing any difference.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-175835f elementor-align-center button-principale elementor-widget elementor-widget-button\" data-id=\"175835f\" data-element_type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm elementor-animation-grow\" href=\"https:\/\/datascientest.com\/en\/data-courses\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t<span class=\"elementor-button-text\">Read more about Oracle RAC<\/span>\n\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-739d0f7 e-flex e-con-boxed e-con\" data-id=\"739d0f7\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-ebbf668 elementor-widget elementor-widget-heading\" data-id=\"ebbf668\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h2 class=\"elementor-heading-title elementor-size-xl\">How does it work? The technical backstage<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c7fd9cb elementor-widget elementor-widget-text-editor\" data-id=\"c7fd9cb\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">The secret to this well-oiled machine is its cluster architecture: several servers, known as <\/span><b>nodes<\/b><span style=\"font-weight: 400;\">, each run an Oracle instance but all share access to the same <\/span><b>shared storage<\/b><span style=\"font-weight: 400;\"> where the data is stored.<\/span><\/p><p><span style=\"font-weight: 400;\">To ensure data consistency among these instances, RAC employs a technology called <\/span><b>Cache Fusion<\/b><span style=\"font-weight: 400;\">. Instead of constantly writing to disk, the nodes exchange data blocks directly in memory via a <\/span><b>high-speed interconnect<\/b><span style=\"font-weight: 400;\">.<\/span><\/p><p><span style=\"font-weight: 400;\">This enables performance akin to a centralized system but with the resilience of a distributed system. Complementing this is a cluster manager (<\/span><b>Oracle Clusterware<\/b><span style=\"font-weight: 400;\">) that orchestrates everything from failure detection to automatic instance restarting.<\/span><\/p><p><span style=\"font-weight: 400;\">The result is an infrastructure capable of <\/span><b>absorbing any failure without missing a beat<\/b><span style=\"font-weight: 400;\">. Should a server fail, the others continue to run the database without any data loss or interruption in transactions.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-61ee369 elementor-widget elementor-widget-image\" data-id=\"61ee369\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor - v3.15.0 - 02-08-2023 *\/\n.elementor-widget-image{text-align:center}.elementor-widget-image a{display:inline-block}.elementor-widget-image a img[src$=\".svg\"]{width:48px}.elementor-widget-image img{vertical-align:middle;display:inline-block}<\/style>\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"1500\" height=\"1201\" src=\"https:\/\/datascientest.com\/en\/files\/2025\/06\/datascientest-oracle-rac-1.webp\" class=\"attachment-full size-full wp-image-196752\" alt=\"\" srcset=\"https:\/\/datascientest.com\/en\/files\/2025\/06\/datascientest-oracle-rac-1.webp 1500w, https:\/\/datascientest.com\/en\/files\/2025\/06\/datascientest-oracle-rac-1-300x240.webp 300w, https:\/\/datascientest.com\/en\/files\/2025\/06\/datascientest-oracle-rac-1-1024x820.webp 1024w, https:\/\/datascientest.com\/en\/files\/2025\/06\/datascientest-oracle-rac-1-768x615.webp 768w\" sizes=\"(max-width: 1500px) 100vw, 1500px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-f007770 e-flex e-con-boxed e-con\" data-id=\"f007770\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-6c95dd1 elementor-widget elementor-widget-heading\" data-id=\"6c95dd1\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h2 class=\"elementor-heading-title elementor-size-xl\">The real benefits of Oracle RAC<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d9a1ee8 elementor-widget elementor-widget-text-editor\" data-id=\"d9a1ee8\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">RAC&#8217;s primary strength is its <\/span><b>high availability<\/b><span style=\"font-weight: 400;\">. If one server fails, there&#8217;s no impact on the user. The other nodes in the cluster immediately assume the load. For sensitive sectors (finance, healthcare, e-commerce&#8230;), it offers a <\/span><b>guarantee of peace of mind<\/b><span style=\"font-weight: 400;\">.<\/span><\/p><p><span style=\"font-weight: 400;\">The second advantage: horizontal scalability. Need more power? Just add a node to the cluster. There&#8217;s no need to stop the database or perform migrations. <\/span><b>Elasticity is built-in<\/b><span style=\"font-weight: 400;\">. Another strong point is the <\/span><b>dynamic distribution of queries<\/b><span style=\"font-weight: 400;\">. The cluster can distribute sessions, connections, and loads among different instances, based on available resources.<\/span><\/p><p><span style=\"font-weight: 400;\">This ensures <\/span><b>continuous fluidity<\/b><span style=\"font-weight: 400;\">, even during peak load times. Not to mention, RAC allows for <\/span><b>centralized management<\/b><span style=\"font-weight: 400;\"> while benefiting from a distributed architecture. It&#8217;s a rarity in the world of critical databases, where complexity is often the price to pay for <\/span><b>robustness<\/b><span style=\"font-weight: 400;\">. This combination of <\/span><b>fault tolerance<\/b><span style=\"font-weight: 400;\">, <\/span><b>optimized performance, and smooth scalability<\/b><span style=\"font-weight: 400;\"> establishes RAC as a true benchmark!<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e43f1aa elementor-align-center button-principale elementor-widget elementor-widget-button\" data-id=\"e43f1aa\" data-element_type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm elementor-animation-grow\" href=\"https:\/\/datascientest.com\/en\/data-courses\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t<span class=\"elementor-button-text\">Learn to deploy Oracle RAC<\/span>\n\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-0524d2e e-flex e-con-boxed e-con\" data-id=\"0524d2e\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-a963a47 elementor-widget elementor-widget-heading\" data-id=\"a963a47\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h2 class=\"elementor-heading-title elementor-size-xl\">Use cases where RAC truly shines<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f0cf7eb elementor-widget elementor-widget-text-editor\" data-id=\"f0cf7eb\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">Oracle RAC excels wherever the slightest downtime costs money, reputational damage, or even human harm. Take the example of a <\/span><b>bank<\/b><span style=\"font-weight: 400;\">. An Oracle database hosting <\/span><b>client transactions<\/b><span style=\"font-weight: 400;\"> simply cannot afford failure.<\/span><\/p><p><span style=\"font-weight: 400;\">A RAC cluster ensures <\/span><b>uninterrupted service<\/b><span style=\"font-weight: 400;\">, even if a server conks out amidst a trading day. The same principle applies in telecoms. <\/span><b>Billing<\/b><span style=\"font-weight: 400;\">, <\/span><b>calls<\/b><span style=\"font-weight: 400;\">, and <\/span><b>access to customer data<\/b><span style=\"font-weight: 400;\"> are all conducted in real-time.<\/span><\/p><p><span style=\"font-weight: 400;\">A <\/span><b>database failure<\/b><span style=\"font-weight: 400;\"> renders services unusable, dissatisfies clients, and damages reputation. With Oracle\u2019s solution, calls continue uninterrupted. In the <\/span><b>healthcare sector<\/b><span style=\"font-weight: 400;\">, RAC can support critical applications for <\/span><b>medical records management<\/b><span style=\"font-weight: 400;\">. Each node in the cluster provides an added layer of reassurance against interruptions in accessing critical data.<\/span><\/p><p><span style=\"font-weight: 400;\">In e-commerce, it&#8217;s a matter of <\/span><b>revenue<\/b><span style=\"font-weight: 400;\">. During peak shopping events like Black Friday, a second of lag can translate to reduced conversions. Yet, RAC enables the absorption of massive traffic spikes without slowdowns or crashes. That\u2019s why it\u2019s an excellent choice for ensuring <\/span><b>continuous availability, scalability, and ultimate reliability<\/b><span style=\"font-weight: 400;\">.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0fd569f elementor-widget elementor-widget-image\" data-id=\"0fd569f\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"1500\" height=\"938\" src=\"https:\/\/datascientest.com\/en\/files\/2025\/06\/datascientest-oracle-rac-3.webp\" class=\"attachment-full size-full wp-image-196753\" alt=\"\" srcset=\"https:\/\/datascientest.com\/en\/files\/2025\/06\/datascientest-oracle-rac-3.webp 1500w, https:\/\/datascientest.com\/en\/files\/2025\/06\/datascientest-oracle-rac-3-300x188.webp 300w, https:\/\/datascientest.com\/en\/files\/2025\/06\/datascientest-oracle-rac-3-1024x640.webp 1024w, https:\/\/datascientest.com\/en\/files\/2025\/06\/datascientest-oracle-rac-3-768x480.webp 768w\" sizes=\"(max-width: 1500px) 100vw, 1500px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-a09ec05 e-flex e-con-boxed e-con\" data-id=\"a09ec05\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-abae211 elementor-widget elementor-widget-heading\" data-id=\"abae211\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h2 class=\"elementor-heading-title elementor-size-xl\">Limits, constraints... and alternatives<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8abf010 elementor-widget elementor-widget-text-editor\" data-id=\"8abf010\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">Despite its many benefits, Oracle RAC is not suitable for everyone. The first obvious constraint is <\/span><b>the cost<\/b><span style=\"font-weight: 400;\">. Between Oracle Enterprise Edition licenses, the RAC option, servers, shared storage, and the necessary expertise&#8230; expenses can skyrocket.<\/span><\/p><p><span style=\"font-weight: 400;\">It\u2019s not a \u201cplug and play\u201d system, but an <\/span><b>elite infrastructure<\/b><span style=\"font-weight: 400;\">, necessitating significant investment commensurate with its features. The second constraint is <\/span><b>operational complexity<\/b><span style=\"font-weight: 400;\">. Setting up, maintaining, and troubleshooting a RAC environment requires advanced skills.<\/span><\/p><p><span style=\"font-weight: 400;\">This is a <\/span><b>demanding ecosystem<\/b><span style=\"font-weight: 400;\">, often requiring a <\/span><b>dedicated DBA team<\/b><span style=\"font-weight: 400;\">. Another limitation is that not all applications scale well with RAC. Some poorly designed or highly monolithic applications don\u2019t fully benefit from clustering. The application architecture must be designed to leverage this distribution.<\/span><\/p><p><span style=\"font-weight: 400;\">For those seeking simpler (or cheaper) alternatives, Oracle offers <\/span><b>Data Guard<\/b><span style=\"font-weight: 400;\"> for disaster recovery or <\/span><b>GoldenGate<\/b><span style=\"font-weight: 400;\"> for replication. In the cloud, services like the <\/span><b>Oracle Autonomous Database<\/b><span style=\"font-weight: 400;\"> deliver high availability without the hassle of cluster management.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a02ca10 elementor-align-center button-principale elementor-widget elementor-widget-button\" data-id=\"a02ca10\" data-element_type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm elementor-animation-grow\" href=\"https:\/\/datascientest.com\/en\/data-courses\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t<span class=\"elementor-button-text\">Master Oracle RAC functionalities<\/span>\n\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-c25497b e-flex e-con-boxed e-con\" data-id=\"c25497b\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-5d8bd84 elementor-widget elementor-widget-heading\" data-id=\"5d8bd84\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h2 class=\"elementor-heading-title elementor-size-xl\">What about Oracle RAC in the cloud?<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5ad7738 elementor-widget elementor-widget-text-editor\" data-id=\"5ad7738\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">Long reserved for on-premises data centers, Oracle RAC has finally made the leap to the Cloud. But only to <\/span><b>Oracle Cloud Infrastructure<\/b><span style=\"font-weight: 400;\">, as it is presently the sole Cloud environment officially supported for RAC in true production.<\/span><\/p><p><span style=\"font-weight: 400;\">This allows the deployment of a <\/span><b>complete RAC cluster<\/b><span style=\"font-weight: 400;\"> on virtual machines or <\/span><b>bare metal in OCI<\/b><span style=\"font-weight: 400;\">, with <\/span><b>shared storage via Oracle Cloud Block Volumes or Exadata Cloud Service<\/b><span style=\"font-weight: 400;\">. And contrary to popular belief, this is not a toned-down version: it includes all the critical features of RAC: <\/span><b>high availability, Cache Fusion, fast interconnect&#8230;<\/b><span style=\"font-weight: 400;\"> but gains cloud-native flexibility and elasticity.<\/span><\/p><p><span style=\"font-weight: 400;\">The primary advantage is there\u2019s no longer a need to manage hardware. Oracle takes care of it. A few clicks suffice to add a node to the cluster. However, a fully supported Oracle RAC installation is impossible on <\/span><a href=\"https:\/\/datascientest.com\/en\/microsoft-azure-empower-yourself-with-knowledge\"><span style=\"font-weight: 400;\">Azure<\/span><\/a><span style=\"font-weight: 400;\">, <\/span><a href=\"https:\/\/datascientest.com\/en\/amazon-web-services-aws-unveiling-the-power-of-the-amazon-cloud\"><span style=\"font-weight: 400;\">AWS<\/span><\/a><span style=\"font-weight: 400;\">, or GCP. These platforms offer alternatives, such as <\/span><b>multi-AZ replication<\/b><span style=\"font-weight: 400;\"> or <\/span><b>managed databases<\/b><span style=\"font-weight: 400;\">, but they don\u2019t replace RAC for intensely demanding workloads.<\/span><\/p><p><span style=\"font-weight: 400;\">Also note that Oracle now promotes <\/span><b>Autonomous Database<\/b><span style=\"font-weight: 400;\"> and <\/span><b>Exadata Cloud@Customer<\/b><span style=\"font-weight: 400;\"> offerings, integrating high availability mechanisms\u2026 without necessarily relying on RAC. This opens the door to new hybrid models: a core <\/span><b>Oracle RAC on OCI<\/b><span style=\"font-weight: 400;\">, connected to managed or on-premises services via <\/span><b>FastConnect<\/b><span style=\"font-weight: 400;\">.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8e2c951 elementor-widget elementor-widget-image\" data-id=\"8e2c951\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"1500\" height=\"814\" src=\"https:\/\/datascientest.com\/en\/files\/2025\/06\/datascientest-oracle-rac-2.webp\" class=\"attachment-full size-full wp-image-196754\" alt=\"\" srcset=\"https:\/\/datascientest.com\/en\/files\/2025\/06\/datascientest-oracle-rac-2.webp 1500w, https:\/\/datascientest.com\/en\/files\/2025\/06\/datascientest-oracle-rac-2-300x163.webp 300w, https:\/\/datascientest.com\/en\/files\/2025\/06\/datascientest-oracle-rac-2-1024x556.webp 1024w, https:\/\/datascientest.com\/en\/files\/2025\/06\/datascientest-oracle-rac-2-768x417.webp 768w\" sizes=\"(max-width: 1500px) 100vw, 1500px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-3a5ae7e e-flex e-con-boxed e-con\" data-id=\"3a5ae7e\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-a2ce81b elementor-widget elementor-widget-heading\" data-id=\"a2ce81b\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h2 class=\"elementor-heading-title elementor-size-xl\">Oracle RAC, between fault tolerance and continuity promise<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b16ffa5 elementor-widget elementor-widget-text-editor\" data-id=\"b16ffa5\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">Every minute of downtime can cost thousands of euros. In the face of this danger, Oracle RAC stands as a <\/span><b>robust, high-performance, and resilient solution<\/b><span style=\"font-weight: 400;\">. Whether it\u2019s for securing <\/span><b>banking transactions<\/b><span style=\"font-weight: 400;\">, supporting <\/span><b>vital medical applications<\/b><span style=\"font-weight: 400;\">, or handling surges on an e-commerce site, it meets the challenge of business continuity without sacrificing performance.<\/span><\/p><p><span style=\"font-weight: 400;\">However, deploying such technology requires more than basic knowledge: you must <\/span><b>master the Oracle ecosystem<\/b><span style=\"font-weight: 400;\">, understand cloud logics, and know how to translate business needs into concrete solutions.<\/span><\/p><p><span style=\"font-weight: 400;\">This is precisely what the Oracle Cloud Finance Consultant training from DataScientest teaches you! It&#8217;s designed for finance, IT, or business management professionals, immersing you in the <\/span><b>Oracle Cloud ERP<\/b><span style=\"font-weight: 400;\"> environment, <\/span><b>Finance<\/b><span style=\"font-weight: 400;\">\u2026 and of course, the administration of Oracle solutions, including RAC in a cloud context.<\/span><\/p><p><span style=\"font-weight: 400;\">Thanks to a project-oriented approach, you&#8217;ll learn how to deploy <\/span><b>Oracle Cloud solutions<\/b><span style=\"font-weight: 400;\">, configure financial modules, and manage critical architectures in a cloud environment. All this is available in <\/span><b>BootCamp<\/b><span style=\"font-weight: 400;\">, <\/span><b>apprenticeship<\/b><span style=\"font-weight: 400;\">, or <\/span><b>Continuing Education<\/b><span style=\"font-weight: 400;\"> formats, complete with <\/span><a href=\"https:\/\/datascientest.com\/en\/all-about-oracle-certification\"><span style=\"font-weight: 400;\">official Oracle certification<\/span><\/a><span style=\"font-weight: 400;\"> upon completion.<\/span><\/p><p><span style=\"font-weight: 400;\">Funded via CPF or France Travail, it\u2019s a significant opportunity to <\/span><b>advance your skills<\/b><span style=\"font-weight: 400;\"> in a high-demand field. Train now with <\/span><b>DataScientest<\/b><span style=\"font-weight: 400;\"> and <\/span><b>become an Oracle expert<\/b><span style=\"font-weight: 400;\"> ready to meet the challenges of critical systems!<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6392e0e elementor-align-center button-principale elementor-widget elementor-widget-button\" data-id=\"6392e0e\" data-element_type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm elementor-animation-grow\" href=\"https:\/\/datascientest.com\/en\/data-courses\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t<span class=\"elementor-button-text\">Register for DataScientest training<\/span>\n\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-9dbb808 e-flex e-con-boxed e-con\" data-id=\"9dbb808\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-ac8bc65 elementor-widget elementor-widget-html\" data-id=\"ac8bc65\" data-element_type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<script type=\"application\/ld+json\">\r\n{\r\n  \"@context\": \"https:\/\/schema.org\",\r\n  \"@type\": \"FAQPage\",\r\n  \"mainEntity\": [\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"What exactly is Oracle RAC?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"Oracle RAC allows the Oracle Database to run simultaneously on multiple servers accessing the same database, ensuring fault tolerance and scalability.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"How does it work? The technical backstage\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"Oracle RAC uses multiple nodes with shared storage and Cache Fusion to maintain data consistency and high-speed communication between servers.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"The real benefits of Oracle RAC\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"Oracle RAC offers high availability, horizontal scalability, dynamic load distribution, and centralized management for critical databases.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"Use cases where RAC truly shines\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"Oracle RAC is ideal in sectors like banking, telecoms, healthcare, and e-commerce where downtime is unacceptable and performance is critical.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"Limits, constraints... and alternatives\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"RAC requires high investment, technical expertise, and is not suited for all applications. 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Discover how it works, its advantages, and why it remains one of the most reliable solutions on the market for critical systems! Zero downtime. It&#8217;s the promise every company dreams of making, especially when its data powers real-time operations. But [&hellip;]<\/p>\n","protected":false},"author":45,"featured_media":196751,"comment_status":"open","ping_status":"open","sticky":false,"template":"elementor_theme","format":"standard","meta":{"content-type":"","inline_featured_image":false},"categories":[2429],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.7 (Yoast SEO v21.7) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What is Oracle RAC (Real Application Clusters)?<\/title>\n<meta name=\"description\" content=\"Oracle RAC: discover how this high availability solution ensures continuity, fault tolerance, and scalability for critical databases.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/datascientest.com\/en\/all-aboutoracle-rac\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What is Oracle RAC (Real Application Clusters)?\" \/>\n<meta property=\"og:description\" content=\"Oracle RAC is a technology designed to ensure continuity of services even when infrastructures fail. 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