Data Block Selectivity | Teradata Vantage - 17.00 - Data Block Selectivity - Teradata Workload Management

Teradata Vantageā„¢ - Workload Management User Guide

prodname
Advanced SQL Engine
Teradata Workload Management
vrm_release
17.00
created_date
June 2020
category
Administration
User Guide
featnum
B035-1197-170K

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.