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The Definitive Guide to Power Query (M)

You're reading from   The Definitive Guide to Power Query (M) Mastering complex data transformation with Power Query

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Product type Paperback
Published in Mar 2024
Publisher Packt
ISBN-13 9781835089729
Length 758 pages
Edition 1st Edition
Languages
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Authors (3):
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Greg Deckler Greg Deckler
Author Profile Icon Greg Deckler
Greg Deckler
Melissa de Korte Melissa de Korte
Author Profile Icon Melissa de Korte
Melissa de Korte
Rick de Groot Rick de Groot
Author Profile Icon Rick de Groot
Rick de Groot
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Table of Contents (19) Chapters Close

Preface 1. Introducing M FREE CHAPTER 2. Working with Power Query/M 3. Accessing and Combining Data 4. Understanding Values and Expressions 5. Understanding Data Types 6. Structured Values 7. Conceptualizing M 8. Working with Nested Structures 9. Parameters and Custom Functions 10. Dealing with Dates, Times, and Durations 11. Comparers, Replacers, Combiners, and Splitters 12. Handling Errors and Debugging 13. Iteration and Recursion 14. Troublesome Data Patterns 15. Optimizing Performance 16. Enabling Extensions 17. Other Books You May Enjoy
18. Index

Performance tips

Optimizing performance is a complicated topic, even after learning about all the different perspectives in this chapter. As with all optimization topics, you’ll have to test different approaches for your situation. However, we have several general performance tips:

  • Connect your query to a fast data source. If your source system is slow, consider moving the data to a faster source or storing your data in a dataflow.
  • Maximize the number of steps that your query folding mechanisms can fold. If you’re adept at SQL, consider crafting an efficient SQL query and apply the EnableFolding parameter. If SQL is not your strength, prioritize placing foldable steps early in your query. This approach helps ensure that your data source handles most of the transformations.
  • When your query steps no longer fold, the next focus should be reducing your query’s memory usage. That means filtering rows and removing columns as soon as possible....
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