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 …
As a Teradata SQL specialist, skew is a common challenge. In fact, approximately 90% of SQL performance difficulties stem from skew, based on my experience. However, this article focuses on the potential for minor modifications to yield significant improvements. This article highlights the potential consequences of selecting inappropriate character sets on SQL performance, a commonly …
Learn an unusual trick to improve the performance of joining partitioned tables with different primary indexes or partitioning. Read on to find out more.
Learn about Teradata Utility Workload and its specialized and optimized user requests that are not SQL protocol-based. Explore its protocols and management techniques.
Learn about Teradata Workload and its benefits in this article. Workloads group requests with common characteristics, making it easier to manage them.
Teradata administrators worldwide face similar challenges. I propose creating a worldwide database containing the characteristics of Teradata systems. This will allow for easy comparison and analysis of performance issues between different systems. My initial report displays the CPU’s idle time and the number of disks I/O waits for every hour throughout the day. To contribute …
Learn about Teradata Statistics Extrapolation, a technique that allows for reasonable estimations when querying historical data with stale statistics.
Get a Grip on Clumpy Row Distribution – the Teradata PPI Table. For this technique to work properly, the primary index in Teradata should not include the partition column(s). We have all encountered the issue of slow table inserts, where the distribution of rows across all AMPs is even, but the merge step takes excessive time. …
Learn how specialization in Teradata development can lead to the development of huge SQL statements and how to reduce the risk of bad performance.
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