322 technical articles on Teradata, Snowflake, Databricks, SQL tuning and data warehouse architecture — written from production experience, not vendor decks.
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.
Learn how Teradata stores dates internally as INTEGER values and how to efficiently calculate dates after 1900-01-01 using a simple formula. Get more useful Teradata date calculations in this article.
Learn why you should opt for DELETE instead of DROP when it comes to Teradata DDL. Avoid locking dictionary tables and conserve resources.
Teradata DBMS offers various compression options to save disk space and improve performance. But, the cost of implementing the compression takes man-time. This article discusses the cost vs. benefit of compression and suggests carefully considering the compression setting when designing new or modifying existing tables.
I made organizing Stored Procedures into Chapters and Steps a principle. These separation points are marked by comments and variables used in performance and result logging. A step refers to a technical or conceptual task that cannot be further divided without losing the abstraction of Stored Procedures or the main task. Examples of a step …
Discover the importance of Teradata statistics in optimizing query execution plans. Learn how to collect statistics and when to use them for best results.
Turning on the Teradata Locking Loggerby Vasudeva Rao To activate the locking logger, access the DBS console window or cnsterm subsystem and ensure it is enabled. Note that the change will only take effect once the database has been restarted. Below is the dbscontrol help output for the flag that governs the locking logger: 9. LockLogger …
Teradata UNION ALL – The New Features of Release 16 Teradata 16 introduces new features for UNION ALL queries that can enhance their performance, although their application is not guaranteed. The Optimizer will opt for executing the query through conventional methods if the cost estimations for the traditional execution plan are lower. It is crucial …
TO_NUMBER I have often needed a function to verify whether a character column contains a numeric value. Typically, I have resorted to using a workaround, such as: CASE WHEN UPPER(‘12.77’) = LOWER(‘12.77’) THEN ‘IS_NUMERIC’ ELSE ‘IS_NOT_NUMERIC’ END Naturally, this workaround is limited and cannot manage certain situations, such as consecutive special characters. With the introduction …
Teradata Big Data Blocks – Introduction Teradata 13.10 introduced larger file systems components, such as cylinders and data blocks. The cylinder size was increased from 1.9 MB to 11.3 MB, while the data block size limit was raised from 127.5 KB to 1 MB in Teradata 14.10. Teradata 14.10 allows temporary rows in spool space …
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