Teradata
A collection of 307 issues
Teradata SQL Tuning: How Query Rewriting Can Reduce Runtime from 40 Minutes to Seconds
It's time to share a new Teradata SQL tuning case study that showcases the impressive impact of query rewriting on performance.
We are studying the query below that originally took 40 minutes to run.
As a SQL tuning specialist, I always prioritize adding missing statistics and refreshing stale
Teradata vs. Redshift: A Comparison of Join Strategies and Architecture
High-Performance Calculations with Teradata Ordered Analytical Functions
Teradata employs two distinct approaches in Ordered Analytic Functions for preparing the data layout necessary for processing. This article explains both approaches and their respective advantages and disadvantages.
Teradata Ordered Analytical Functions
Teradata Analytic Functions are versatile tools that allow for a wide range of applications. The ability to retrieve
Understanding Teradata Join Estimation: Heuristics and Importance of Statistics Collection
What is Teradata Join Estimation?
This article demonstrates the functioning of Teradata Join Estimation in the absence of statistics. It presents the heuristics employed to estimate row count and emphasizes the importance of collecting statistics on all join columns.
Teradata Join Estimation Heuristics
The worst-case scenario involves joining two tables
Detecting Overlapping Time Periods with Teradata OVERLAPS Command: A Simple Syntax Guide
Learn how to use the Teradata OVERLAPS command to detect overlapping time periods with this example query. Caution: minimum overlap required.
Optimizing Teradata Statements Containing Multiple JOINS
1. Outline
This showcase demonstrates optimizing statements with multiple JOINs using Teradata Optimizer's tuning approach. The approach efficiently determines the best JOIN strategy and implements data redistribution instead of duplication when necessary.
Identify and break down underperforming segments to optimize complex logic with multiple joins. Employ an execution
Optimizing Queries with LIKE Operator in Teradata
Learn how to optimize LIKE operator queries in Teradata to avoid full table scans and improve performance. Read on for expert tips and tricks.
Teradata Columnar Compression Methods: Run-Length, Dictionary, and Delta Compression
Learn about the benefits of compression in Teradata Columnar, including a reduction in permanent space and disk IOs. Different compression methods are used, including run-length, dictionary, and delta compression. This article explains how each method works and the advantages of using them.