New in Oracle WebLogic Server 12.2.1, Continuous Availability! Continuous Availability is an end to end solution for building Multi Data Center architectures. With Continuous Availability, applications running in multi data center environments can run in Active-Active environments continuously. When one site fails the other site will recover work for the failed site.During upgrades, applications can still run continuously with zero down time.What ties it all together is automated data site failover, reducing human error and risk during failover or switchover events.
Reduce Application Downtime
WebLogic Zero Down Time Patching (ZDT): Automatically orchestrates the rollout of patches and updates, while avoiding downtime and session loss.Reduces risk, cost and session downtime by automating the rollout process.ZDT automatically retries on failure and rollsback on retry failure retry. Please read the blog Zero Downtime Patching Released!to learn more about this feature.
WebLogic Multitenant Live Partition Migration : In Multitenant environments Live Partition Migration is the ability to move running partitions and resource groups from one cluster to another, without impacting application users.During upgrade, load balancing, or imminent failure partitions can be migrated with zero impact to applications.
Coherence Persistence :Persists cache data and metadata to durable storage.In case of failure of one or more Coherence servers, or the entire cluster, the persisted data and metadata can be recovered.
Replicate State for Multi-Datacenter Deployments
WebLogic Cross Domain XA Recovery : When a WebLogic Server domain fails in one site or the entire site comes down, the ability to automatically recover transactions in a domain on the surviving site. This allows automated transaction recovery in Active-Active Maximum Availability Architectures.
Coherence Federated Caching :Distributes Coherence updates across distributed geographical sites with conflict resolution.The modes of replication are Active-Active with data being continuously replicated and providing applications access to their local cached data, Active-Passive with the passive site serving as backup of the active site, and Hub Spoke where the Hub replicates the cache data to distributed Spokes.
Operational Support for Site Failover
Oracle Traffic Director (OTD) : Fast, reliable, and scalable software load balancer that routes traffic to application servers and web servers in the network.Oracle Traffic Director is aware of server availability, when a server is added to the cluster OTD starts routing traffic to that server.OTD itself can be highly available either in Active-Active or Active-Passive mode.
Oracle Site Guard : Provides end-to-end Disaster Recovery automation. Oracle Site Guard automates failover or switchover by starting stopping site components in a predetermined order, running scripts and post failover checks.Oracle Site guard minimizes down time and human error during failover or switchover.
Continuous Availability provides flexibility by supporting different topologies to meet application needs.
Active-Active Application Tier with Active-Passive Database Tier
Active-Passive Application Tier with Active-Passive Database Tier
Active-Active Stretch Cluster with Active-Passive Database Tier
Continuous Availability provide applications with Maximum Availability and Productivity, Data Integrity and Recovery, Local Access to data in multi data center environments, Real Time access to data updates, Automated Failover and Switchover of sites, and Reduce Human Error and Risk during failover/switchover.Protect your applications from down time with Continuous Availability.If you want to learn more please read Continuous Availability documentationor watch the Continuous Availability video.