Oracle Real Application Clusters (RAC) is the cornerstone high-availability and scalability architecture for Oracle Database deployments in mission-critical environments — financial exchanges, banking core systems, insurance policy administration platforms, telecommunications billing stacks, and healthcare clinical data repositories. RAC allows multiple server nodes to access a single shared database simultaneously, providing active-active failover, workload balancing across nodes, and linear scalability by adding cluster members without downtime. For organisations whose applications were designed and tuned around RAC's shared-cache architecture — Cache Fusion, Cluster Wait Events, Global Cache Service — there is no simple migration path to Oracle's current preferred model without substantial re-architecture work.
Oracle's account teams are aggressively repositioning Oracle RAC on commodity hardware as a legacy configuration and pushing two migration vectors: Oracle Exadata (on-premise or Cloud@Customer) and Oracle Exadata Database Service on Oracle Cloud Infrastructure (ExaDB-D). Both carry substantial licensing and infrastructure cost uplifts. Oracle's sales narrative includes technical deprecation signals ("certain RAC features receive limited investment"), support lifecycle pressure at renewal, and Exadata pricing that makes the hardware cost look like an investment rather than a premium. Third-party support on Oracle RAC 11gR2 through 19c cuts annual support costs by 50–65%, removes Oracle's migration leverage, and preserves your mission-critical HA architecture on its proven configuration while you plan any evolution on your own terms.
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Oracle RAC 11gR2 (11.2.0.4) is in Sustaining Support — no new patches, no regulatory updates since Jan 2015. Oracle RAC 12c R1 (12.1.0.2) entered Sustaining Support in July 2022. Oracle RAC 12c R2 (12.2.0.1) and 18c are also in Sustaining Support as of 2022 and 2021 respectively. Oracle RAC 19c remains in Premier Support through April 2024 and Extended Support through April 2027. For all pre-19c RAC environments, TPS is immediately relevant. See our Oracle TPS complete guide for Oracle's full lifecycle methodology.
Oracle Exadata and ExaDB Cloud Migration — The Real Cost of Oracle's "Modernisation" Pitch
Oracle's standard alternative to commodity RAC is Exadata — either on-premise Exadata X9M/X10M or Exadata Cloud@Customer (ExaCC). For organisations already on RAC, Oracle positions Exadata as a performance-optimised upgrade that eliminates cluster management complexity. The reality for large RAC deployments is a multi-layer cost and risk profile that Oracle's account teams rarely present in full.
Oracle Exadata on-premise (X10M Quarter/Half/Full Rack) carries a hardware list price of £350K–£2.8M per rack, plus Oracle Database EE Unlimited licensing (Exadata's standard model), which for organisations currently on Named User Plus or Processor licensing on commodity servers represents a significant licence model restructuring. Oracle ExaDB on OCI (Database Service Dedicated) carries a consumption cost model that for a large RAC replacement with 32+ OCPU and 500+ TB storage typically runs £800K–£2.5M per year in OCI compute and storage fees before any migration or re-integration costs. System integrator costs for migrating a complex multi-application RAC cluster to either Exadata model — including application compatibility testing, ASM to ASM storage migration, GoldenGate replication layer for migration continuity, and post-migration performance validation — range from £600K–£3.5M with a 12–24 month delivery timeline. GoVendorFree TPS on the existing RAC environment eliminates Oracle's migration leverage entirely.
Oracle RAC Version Matrix — TPS Eligibility
| Version | Key Capabilities | Oracle Support Status | TPS Available |
|---|---|---|---|
| Oracle RAC 11gR2 (11.2.0.4) | Cache Fusion, ASM, GES/GCS framework, Active Data Guard integration | Sustaining Support only | ✓ Yes — large TPS cohort |
| Oracle RAC 12c R1 (12.1.0.2) | Flex Clusters, Oracle Clusterware Policy Mgmt, SCAN enhancements | Sustaining Support only | ✓ Yes — ideal TPS candidate |
| Oracle RAC 12c R2 (12.2.0.1) | Sharding, Multitenant RAC, In-Memory aggregation on RAC | Sustaining Support only | ✓ Yes — TPS recommended |
| Oracle RAC 18c (18.x) | Active-active DML, autonomous configuration features | Sustaining Support only | ✓ Yes |
| Oracle RAC 19c (19.x) | Automatic Indexing, Real-Time Statistics, JSON improvements | Extended Support (ends Apr 2027) | ✓ Yes — proactive TPS candidate |
| Oracle RAC 21c | Blockchain tables, native JSON datatype, AutoML in DB | Premier Support | ✓ Yes |
| Oracle RAC on Exadata | Smart Scan, Storage Indexes, IORM, Hybrid Columnar Compression | Bundled with Exadata | ✓ Yes — Exadata TPS available |
GoVendorFree TPS Coverage for Oracle RAC
GoVendorFree's Oracle TPS covers the full RAC stack — Oracle Clusterware, Oracle Database Enterprise Edition, ASM, Oracle Net Services cluster configuration, and the underlying OS-level cluster integration. Coverage includes:
- Oracle Clusterware: CRS/OHAS daemon stability (crsd, ocssd, evmd, ons); Grid Infrastructure home management; voting disk and OCR configuration advisory; SCAN listener configuration and TNS routing; cluster node eviction and reboot root cause analysis; clusterware upgrade advisory within supported version range; resource management (ora.db, ora.service, ora.listener) advisory
- Cache Fusion and Global Cache Service: GCS/GES tuning advisory; Cache Fusion wait event analysis (gc buffer busy, gc cr request, gc current block); cluster interconnect throughput and latency advisory; Private Interconnect NIC configuration (jumbo frames, RoCE, InfiniBand); buffer cache sizing for RAC workloads; DRM (Dynamic Resource Mastering) tuning advisory
- ASM (Automatic Storage Management): ASM disk group management stability; ASM rebalance tuning; ASMLIB and ASMLib driver advisory; ASM fast mirror resync; Exadata Smart Flash Cache advisory (where applicable); ASM filtering and disk discovery advisory
- Application-Level RAC Integration: Connection pooling advisory (UCP, OCI connection pool); TAF (Transparent Application Failover) configuration; FAN (Fast Application Notification) event handling; Oracle Services configuration for workload routing; Application Continuity (AC) and Transaction Guard advisory for Oracle 12c+ environments; JDBC Thin and OCI driver RAC connection configuration
- Oracle Net Services (RAC): SCAN DNS and listener configuration; EZCONNECT and TNSNAMES for cluster-aware connection; load balancing advisory (server-side vs. client-side); Dead Connection Detection (DCD) tuning; SSL/TLS encryption for cluster connections; Oracle Net tracing and diagnostic advisory
- OS and Infrastructure: Red Hat Enterprise Linux / Oracle Linux kernel parameter advisory (hugepages, semaphores, shared memory); NTP/Chrony configuration for cluster time synchronisation; kernel.shmmax and vm.swappiness advisory; storage multipathing (DM-Multipath, EMC PowerPath) advisory; shared storage (NFS, ASM, OCFS2) configuration; Infiniband/RoCE NIC driver advisory
Financial Services and Telco — The Core RAC TPS Cohort
Oracle RAC's two dominant industry cohorts — financial services and telecommunications — face structurally similar migration calculus, but with sector-specific regulatory constraints that make TPS the rational choice for each.
In financial services, Oracle RAC underpins core banking platforms (Temenos T24/Transact on Oracle, Oracle FLEXCUBE), real-time payments processing (Faster Payments, SEPA Instant, SWIFT ISO 20022 messaging layers), and trading systems where active-active failover is a regulatory requirement under FCA, EBA, and ECB operational resilience mandates. PRA SS2/21 and FCA PS21/3 impose Recovery Time Objective (RTO) and Recovery Point Objective (RPO) requirements for critical business services that make migrating from a proven RAC HA architecture to a new platform during a live regulatory programme a governance risk CROs and COOs consistently reject. Our financial services industry practice covers the PRA and FCA operational resilience framework for Oracle RAC TPS decisions.
In telecommunications, Oracle RAC supports billing systems (ORACLE Communications Billing and Revenue Management — BRM, Convergys/Amdocs platforms on Oracle), mediation platforms, and network inventory databases where continuous availability is both a commercial SLA obligation to enterprise customers and an Ofcom regulatory requirement. MVNO and tier-one operator billing stacks on Oracle RAC 12c or 11gR2 represent five to eight years of performance tuning, partition design, and workload management configuration — technical investment that a migration to OCI ExaDB would require rebuilding from scratch, not simply porting. See our telco industry practice for the billing platform TPS framework.
In healthcare and public sector, NHS England NHS Shared Business Services platforms, NHS Digital reference data services, and local authority ERP systems running Oracle EBS R12 on RAC face the same calculus: proven HA architecture, no immediate clinical or operational driver for migration, and a budget environment where Oracle Exadata's premium pricing is an impossibility. Our healthcare practice covers the DSP Toolkit and DCB compliance framework for Oracle RAC TPS decisions.
Oracle RAC One Node — TPS Coverage and Relationship to Full RAC
Oracle RAC One Node — Oracle's single-node variant of RAC Clusterware providing online rolling upgrades and cold failover to a second node — is also fully covered under GoVendorFree's Oracle RAC One Node TPS. For organisations considering whether to consolidate from full RAC to RAC One Node as part of a support cost rationalisation exercise, GoVendorFree provides a licence restructuring analysis that assesses the Oracle Database EE and RAC Option licence position under both configurations — ensuring any consolidation does not inadvertently create Oracle licence compliance exposure. See the licence optimisation service for the methodology.