Teradata summary statistics are introduced with Teradata Release 14 and provide the Optimizer with statistics about the number of rows ...

The Teradata Summary Statistics

What is the command DIAGNOSTIC HELPSTATS ON FOR SESSION in Teradata? Collecting statistics is one of the essential activities for ...

Repair your Statistics Landscape with Teradata Diagnostic Helpstats

Teradata table skew: if you’re on this page and reading this, you most likely have encountered the topic of skew ...

Teradata Table Skew Insight – how it can be misleading

How to find out if the Teradata Statistics we created for a specific workload are used? We know that Teradata ...

StatUseCountV – Stop guessing if your Teradata Stats are being used

Introduction to Teradata Dynamic AMP Sampling Teradata calculates them at runtime for indexed columns (PI, USI, NUSI) without statistics. However, ...

Ten Clarifications On Teradata Dynamic AMP Sampling

When Teradata introduced several new features with version 14.10, one of them caught our attention based on the so-called object ...

Improved Teradata Statistics Extrapolation

Introduction to Teradata Sample Statistics This article will show you when, how, and why you can/should use Teradata Sample Statistics. ...

Teradata Sample Statistics

Heuristics are applied whenever no collected statistics are available for a nonindexed column. Heuristics are rules of thumb to estimate ...

Teradata Heuristic Estimations

Biased value histogram entries store exact cardinalities. Statistics that are up to date should reflect the number of rows returned ...

Teradata Statistics: Estimates For Missing Values

In this article, we will analyze a statistics problem in detail. We will figure out why estimations for our example ...

Disassembling Teradata Statistics