Global Data Services Demonstrations

     
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Inter-Database Service Failover
If a database running a global Service crashes, GDS taking into account the Service placement attributes, automatically performs an inter-database Service failover to another available database in the pool. GDS sends Fast Application Notification (FAN) events so that the client connection pools can reconnect to the new database where the global Service has been newly started. This viewlet demonstrates the inter-database global service failover capability of Oracle 12c GDS.                                                                                                                               

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Database Role-based Global Services
Upon a database role transition via Data Guard Broker, GDS can automatically relocate the global Service to the new Primary and the new Standby if the role assigned to the service matches the role of the database. This viewlet demonstrates the role-based global services capability of Oracle 12c GDS for Data Guard configurations.                                                                                                                              

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Locality based Routing
With GDS, customers can choose to configure client connections to be always routed among a set of replicated databases in a local region. This capability allows customers maximize their application performance (avoiding the network latency overhead accessing databases in remote regions). This viewlet demonstrates the region-affinity based routing capability of Oracle 12c GDS.                                                                                                                              

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Lag Tolerance based Routing
A Standby database running on asynchronous replication can sometimes lag behind its Primary. With GDS, applications can now choose between accessing real-time vs. slightly out-of-date data. Applications can set maximum acceptable lag limit for a Global Service. GDS routes requests to replicas whose replication lag is below the limit. When the replication lag at a given Standby database exceeds the configured LAG limit, the Global Service is brought down by GDS and the new requests are routed to a database that satisfies the LAG limit.This viewlet demonstrates the workload routing based on replication lag tolerance capability of Oracle 12c GDS for Data Guard configurations.                                                                                                                              

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Connect-time Load Balancing
GSMs use the load statistics from all databases in the GDS pool, inter-region network latency, and the configured connect-time load balancing goal to route the incoming connections to the best database in a GDS pool. This viewlet demonstrates the connect-time load balancing capability of Oracle 12c GDS for a set of replicated databases.                                                                                                                              


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