17.10 - Detecting Skew - Advanced SQL Engine - Teradata Workload Management

Teradata Vantageā„¢ - Workload Management User Guide

Product
Advanced SQL Engine
Teradata Workload Management
Release Number
17.10
Release Date
July 2021
Content Type
Administration
User Guide
Publication ID
B035-1197-171K
Language
English (United States)

Either CPU or I/O skew percent exceptions can indicate skew. TASM exceptions detect skewed requests based on the number of AMPs active in the request step. A group-AMP request that uses about the same processing time for each AMP involved would not be detected as skewed, even though some AMPs are not affected by the request.