> For the complete documentation index, see [llms.txt](https://docs.pentaho.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.pentaho.com/pdia-data-integration/archived-merged-pages/transforming-data-with-pdi-archive/partitioning-data/get-started.md).

# Get started

By default, each step in a transformation is executed in parallel in a single separate thread. Consider, for example, the transformation below. With a single copy of each step, the data is read from the CSV file input step and then aggregated in the `count by state` step. The results of which can be verified by examining the preview data.

![Partitioning use case example](https://773338310-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FYwnJ6Fexn4LZwKRHghPK%2Fuploads%2Fgit-blob-d77b55150cb5f17e2ca2ed94dd904a7ccaa58db5%2Fpartitioning-usercase-simple.png?alt=media)


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