The specific instance that is connected to is determined by a number of factors, including which instances are available and the load on those instances. Jdbc:datadirect: oracle://server1:1521:ServiceName=Accounting
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This document explains how you can take advantage of Oracle RAC features such as load balancing and connection failover using the DataDirect Connect for JDBC Oracle driver to connect your data critical applications to data. When connection failover occurs and a service connection is redirected to another node, users can continue to access the service, unaware that it is now provided from a different node.
When a node failure occurs, connection attempts can fail over to other nodes in the cluster, which assume the work of the failed node. In addition, an Oracle RAC system can protect against computer failures caused by unexpected hardware failures and operating system or server crashes, as well as processing loss caused by planned maintenance. For example, in the event of a sudden increase in traffic, an Oracle RAC system can distribute the load over many nodes, a feature referred to as load balancing. A cluster architecture, such as Oracle RAC, provides applications access to more horsepower when needed, while allowing computing resources to be used for other applications when database resources are not as heavily required.
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