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Why increase in file size when data loaded into data model|Power Pivot|Excel Forum|My Online Training Hub

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Why increase in file size when data loaded into data model
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Ton Peschier

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September 21, 2020 - 7:24 am
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Hi,

I have an Excel file on a SharePoint folder of about 1 MB. These Excel file contains 10 worksheets with 60 to 90 columns and between 20 to 300 rows of data.

I have another Excel file were I load all the worksheets of this file, via Power Query, to the data model, as connection only. These data model file becomes now about 8 MB. I don't understand why this is. The data is stored only once in the data model and I thought that the data model is able to compress the data. Is there any thing I can do to reduce the file size?

 

Thanks

Ton

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Mynda Treacy
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September 21, 2020 - 9:02 am
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Hi Ton,

Are you able to share the query file and source files?

Power Pivot's compression works best when there are duplicate values in a column. If you have columns of unique values, then there's nothing to compress, so it may be that you have a lot of unique data, as opposed to typical data structures where many columns have repeating values that can be compressed into single records.

Mynda

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