16.20 - 16.50 - How Can I Use Filters to Prevent Poorly Written Queries from Reducing My Performance? - Teradata Viewpoint - Teradata Workload Management

Teradata® Viewpoint User Guide

Product
Teradata Viewpoint
Teradata Workload Management
Release Number
16.20
16.50
Release Date
July 2021
Content Type
User Guide
Publication ID
B035-2206-071K
Language
English (United States)

A poorly written query can return too much data, making the results unusable. These types of queries often produce meaningless results, are very resource-intensive, and reduce the performance of your system.

Using filters, you can protect your system from poorly written queries by preventing these queries from even starting to execute. Rejecting bad queries also helps educate the users to write better and more specific queries, which can reduce the number of bad queries over time.

For information about how to write good queries, see the Teradata SQL documentation.

For example, you can prevent the following queries from executing:
  • Queries that return too many rows
  • Queries that take too long to run
  • Queries that scan very large tables

Scenario assumptions

This scenario assumes you already have the following set up:
  • Teradata Database version: 16.00
  • Operating system: SLES 11
  • System: PROD1
  • Ruleset: BadQueries