Learn about the Teradata Nested Join, the cheapest join method using indexes. We explore its prerequisites, variants, and performance.

What is the Teradata Sample Function? The SAMPLE function returns a set of randomly selected rows. Here are the characteristics: ? The Syntax of the Sample Function SAMPLE [WITH REPLACEMENT] [RANDOMIZED ALLOCATION][WHEN <condition> THEN] {<n...

Fast Path INSERT/SELECT efficiently loads a single table. Requirements for Teradata Fast Path INSERT /SELECT How does the Fast Path INSERT/SELECT work? This reduces access to mass storage (such as hard disk or solid-state disk). The process involves...

A hot standby node belongs to a clique of nodes and does not host virtual processes such as AMPs or Parsing Engines. The standby node remains idle until a member of its clique crashes or fails. At this point, the standby node is activated to take ove...

Without Teradata CHECK Constraint When a non-indexed column is utilized in a retrieval operation (i.e. WHERE statement) and lacks Teradata Check Constraints, the Optimizer employs heuristics to approximate the number of rows in the resulting set by i...

Skewed Teradata Joins – The Initial Situation Consider the scenario where one table includes various currencies while the other comprises customers’ accounts with their corresponding currency. Essentially, the ISO code of the currency serves as a for...

Learn how Teradata Integrated Workload Management assigns workloads to queries and offers features like filters and throttles to improve system performance.

Teradata 16.10 introduces Sparse Maps, a feature to place small table rows on one AMP. Learn more about how it can optimize your system here.

Learn about the Teradata row size limits and how to deal with the "3577 Row size or Sort Key size overflow" error in this informative article.

Teradata data access is categorized based on the number of AMPs involved and the technique employed to search rows within a data block. In our article about SQL Tuning, we mentioned that one of the main goals in performance optimization is to distrib...