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What are the Goals of SQL Tuning?Resource consumption must be minimized to optimize a database system, and three crucial metrics to consider are skew, IOs, and CPU seconds. Our experience has shown that Teradata faces significant challenges with IOs and skew. Transferring rows from mass storage to main storage is a time-intensive process, as Teradata can only transfer data blocks containing a desi
IntroductionAs a tuner, most slow queries can be traced back to two primary causes. The initial cause is the transfer of substantial amounts of data between AMPs. This piece will focus on the second cause: Teradata skewing. Teradata refers to skew as the uneven distribution of a table’s rows across the AMPs. This results in suboptimal utilization of the system’s parallelism and affects queries and
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