As any experienced Teradata DBA will tell you, some tables in the Teradata dictionary (DBC) need housekeeping. But some customer sites that I have worked with ignore table DBC.AccessRights. If you have ever analyzed this table on a Teradata system, you will almost certainly spot two things quickly. Since this is a system table, altering …
Learn about Teradata Heuristics and Optimizer’s approach to estimating cardinality for non-indexed columns in this article. Discover how skew improves estimations and why heuristics should be avoided.
The Teradata Architecture Video Course. This video will give you an overview of the Teradata Shared Nothing Architecture. We will show you how Teradata distributes data evenly across its parallel units and how the components interact. http://youtu.be/uwRdLr8sRdY
Learn about the Teradata Primary Index, which distributes table rows across all AMPs for parallel execution. Discover how to select the best index for performance and avoid hash collisions.
The Teradata Primary Index and Hash Collisions Using either INTEGER or CHARACTER data types for the Teradata Primary Index does not usually impact performance. The hashing algorithm in Teradata is highly efficient. In the rare case where primary index columns from different tables have different CHARACTER SET, there may be minimal performance losses, but this …
Learn the most essential Teradata SQL statements and functions in this article. From CREATE TABLE to Teradata-specific hashing functions, enhance your data manipulation and analysis capabilities on the platform. Whether you’re a beginner or an experienced user, this guide will help you master Teradata SQL skills.
Learn how to optimize Teradata SQL Tuning with comprehensive analysis of available tools in this article. Discover the optimal approach for query optimization for both tactical and strategic workloads, as well as methods for eliminating full table scans, reducing skew, and examining the execution plan. Plus, find out how to address common issues like concurrency and misestimation.
This article presupposes your existing familiarity with the fundamental structure of a Teradata System. As you are aware, the AMPs operate on a Teradata System. The number of AMPs responsible for managing rows stored on their respective virtual disks varies based on the system’s size. There may be hundreds of AMPs. As noted in my …
BLC, Row Level Partitioning, and Datablock Size Tuning In this article, we will learn how block-level compression, row-level partitioning, and selection of the appropriate data block size can be used to influence the Teradata table size and, thus, performance. We will create a test scenario based on a customer master table loaded daily. We will …
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