Database Server Quantity

The Oracle HA database solution for fault tolerance and load balancing is called the Real Application Cluster (RAC). This technology is used by the Oracle hosting center today. One of the advantages of RAC is that it provides load balancing. RAC processes database requests against the database and there is no down time as a passive instance is brought on line if the primary server fails. If the load on the database servers increases over time, more servers can be added to the cluster to gain computing power.