The Tactical tier is for workloads with critical, very short requests that need a response in 1 second or less. Tactical tier requests receive the highest priority available to user work and can consume all the resources they need. Teradata recommends that you use the Tactical tier primarily for single-AMP or few-AMP requests.
Workloads in the Tactical tier run with an expedited status automatically, which gives requests a performance boost by ordering them higher in the AMP message processing queues and by providing access to reserved AMP worker tasks.