Your administrators can make full use of primary and standby systems by routing sessions between two or more systems while maintaining full backup status with Teradata Query Director (Teradata QD). This session-routing tool is most often used with Teradata Dual Active systems.
Teradata QD sits between the client application and two or more Teradata Database systems and routes sessions using rules set by your own administrator. This helps to spread workloads evenly among systems and to failover from one system to another if a database goes down. Teradata QD also performs a failover on user-defined Teradata Database errors.
Teradata QD is a command-line application, or can be run as a Windows service, and is configured at startup. Teradata QD uses command-line parameters (or the parameter file if running as a service), routing configuration file and error code files to make routing decisions.
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