Data Block Selectivity | Teradata Vantage - 17.10 - Data Block Selectivity - 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)

Use the data block selectivity criterion (the percentage of the table the request accesses) to give more resources to requests that access a small subset of the table. For example, you can send a request doing a full-table scan against a large table to a low-priority workload, and send a request accessing only one partition (1/200th of the table) to a high-priority workload.

Data block selectivity is particularly useful on large partitioned tables, but it is also useful for nonpartitioned tables.