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Tableau prep joins4/6/2023 If you need to add an operation or add data transformations in bulk, pause your flow. Pause your flowĪt times, you may not need interactive feedback as you build your flow. Using a smaller data set, when possible, will almost always guarantee better performance, because Prep Builder has less data to cache and query. Filter earlyĭid you know you can filter data in the Input step, before you start cleaning, integrating, and reshaping your data? By filtering out any data that isn’t crucial to your workflow, you narrow down the scope of what Prep Builder must process. Either can be effective, depending on what you need to accomplish. Random sampling will provide a representation of all values in the dataset, whereas quick select sampling will bring in the first number of (x) rows from your data set, based on your sample size. You'll notice you have two sampling methods available: a quick select sample and a random sample. Less data will lead to a faster authoring experience! Prep Builder will automatically start sampling your data at just over one million records, but you can set your flow to sample regardless of whether this threshold has been met. ![]() In scenarios like this, you can sample to speed things up. Say you just need to pivot rows to columns, or union a few tables together. Oftentimes, your data only needs high-level restructuring, which doesn’t require insight into every individual row of data. When you run your flow, whether in Prep Builder or via Prep Conductor, changes are always applied to the entire data set and not just the sample, so that you can walk away with a clean, ready-to-analyze data set. ![]() A simple yet powerful way to ensure high performance is working with only the data you need. While there’s no row limit for working with data sets in Prep Builder, there are considerations to optimize performance-great power comes great responsibility after all. The more data you bring in to Prep Builder while you’re in interactive mode, the more computationally “expensive” your flow will be. ![]()
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