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  • October 29, 2015

Oracle WebLogic Server 12.2.1 Continuous Availability

Monica Riccelli
Product Manager

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

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
: 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

· 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.

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 documentation
or watch the Continuous
Availability video

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