Database Reference
In-Depth Information
The following approaches can be used for multi data center deployment:
• Active - Active
• Active - Passive
Active - Active
This means both primary and secondary data centers will be active at the same time
and user traffic will be equally distributed across data center(s). The Active - Act-
ive approach is recommended if your SOA environment cannot have any planned
downtime. In this architecture, user requests will be equally distributed across mul-
tiple data center(s). Each data center configures with separate web and application
layer clusters.
Achieving real-time active bi-directional data replication is one of challenges for this
approach. The real-time database replication can be achieved using the Oracle
Golden Gate software. The other option is to use the primary database for the traffic
from primary and secondary application servers. Ensure that the latency between
the secondary data center and the primary data center is less than 50 ms and you
get enough bandwidth to cover the rate of change of data replication in almost real
time. You can use Oracle Data Guard or storage replication such as SRDF to back
up data from the primary to secondary database.
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