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Update FAQ
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docs/_pages/faq.md

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@@ -4,15 +4,15 @@ title: Frequently Asked Questions
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permalink: /faq/
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### How can Spout handle such large data sets and still use less than 3MB of memory?
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### How can {{ site.spout_html }} handle such large data sets and still use less than 3MB of memory?
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When writing data, Spout is streaming the data to files, one or few lines at a time. That means that it only keeps in memory the few rows that it needs to write. Once written, the memory is freed.
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When writing data, {{ site.spout_html }} is streaming the data to files, one or few lines at a time. That means that it only keeps in memory the few rows that it needs to write. Once written, the memory is freed.
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Same goes with reading. Only one row at a time is stored in memory. A special technique is used to handle shared strings in XLSX, storing them - if needed - into several small temporary files that allows fast access.
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### How long does it take to generate a file with X rows?
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Here are a few numbers regarding the performance of Spout:
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Here are a few numbers regarding the performance of {{ site.spout_html }}:
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| Type | Action | 2,000 rows (6,000 cells) | 200,000 rows (600,000 cells) | 2,000,000 rows (6,000,000 cells) |
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|------|-------------------------------|--------------------------|------------------------------|----------------------------------|
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| ODS | Read | 1 second | 1-2 minutes | 5-6 minutes |
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| | Write | < 1 second | 35-40 seconds | 5-6 minutes |
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### Does Spout support charts or formulas?
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### Does {{ site.spout_html }} support charts or formulas?
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No. This is a compromise to keep memory usage low. Charts and formulas requires data to be kept in memory in order to be used.
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So the larger the file would be, the more memory would be consumed, preventing your code to scale well.

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