Learn why business intelligence tools often use outer joins and why they can be vulnerable to skewing. Read on to understand the details and risks involved.
Learn how to detect and prevent Teradata skewing, one of the main causes of slow query performance. Discover the different types of skew and how to analyze tables, joins, and column values to detect and resolve issues. With practical tips and example queries, this article is a must-read for performance tuners and database administrators.
Learn how to optimize your Teradata Load Performance by choosing the right loading method per table. Bulk loads for large tables and transactional loads for small ones. Find out more in this article.
Learn how to efficiently add new partitions to a Row Partitioned Table. We compare two methods, ALTER TABLE and INSERT…SELECT, with test results.
Learn about Teradata Spool Space, a temporary workspace used to store intermediate and final result sets. Discover ways to increase and manage Spool Space.
Discover the differences between Teradata MULTISET and SET tables for effective data modeling. Learn how to avoid duplicates and improve performance.
Avoid data warehouse project failures by choosing the right data model. In this article, we explore denormalization techniques for when it makes sense, including repeating groups, prejoins, and derived information. We also discuss alternatives to denormalization, such as Global Temporary Tables and Volatile Tables. Remember, denormalization can improve performance but has significant drawbacks and should be used only when necessary.
Learn about Teradata’s unique secondary indexes (USI) and how they provide an alternate access path to reduce disk IOs while retrieving data. This article explains the technical differences between USI and other indexes, and provides detailed information on the data retrieval process. Discover how to create and use USI effectively, and why recent statistics and high selectivity are important factors to consider. Don’t miss out on this unique insight into Teradata indexing!
Learn how to determine SQL Query Performance in Teradata with these three essential parameters: AMPCPUTime, TotalIOCount, and SpoolUsage. Discover how to get SQL Query Stats and make the right decision for your queries using the DBC tables DBQLOGTBL and DBQLSQLTBL. Follow these three points to consider while running the query and get accurate results.
Discover the benefits of using a Teradata NESTED join strategy for economical data joining. Learn how to enable this feature and optimize query design.
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