Throttle Basics | Teradata Vantage - 17.10 - Throttle Basics - Advanced SQL Engine - Teradata Workload Management

Teradata Vantageā„¢ - Workload Management User Guide

Advanced SQL Engine
Teradata Workload Management
Release Number
Release Date
July 2021
Content Type
User Guide
Publication ID
English (United States)

TASM must make choices on a busy system when demand for resources exceeds availability. Throttles are TASM rules that limit the number of requests, sessions, or load utilities that can run at the same time. Throttles help improve the performance of all requests by reducing resource contention. If a throttle threshold is exceeded, TASM either rejects the work or delays it until the system is less busy. Throttles do not affect work that is already running.

You can apply throttles to the following targets:
  • The entire system
  • Specific workloads or groups of workloads
  • Virtual partitions
  • Utility jobs

System throttles can be active without workload throttles, and vice versa. TASM can also use system and workload throttles together. One request could be under the control of both a system throttle and a workload throttle.

Use workload throttles primarily to prevent too many low-priority requests from running at once, leaving no resources for higher-priority requests.