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This happened with me also when I tried extracting 1 GB of data. I think there is not such connection requirement. It all depends on your data source. If data source is fast then you're lucky.
You can perform optimization at database level such as appropriate indexing, restrict data, etc. If you've too many unique values, it may hinder the performance. So, try to remove those values if they are not required for analysis.
Hope this helps.
thanks a lot!
the host of tableau online is in Missuri?
in the local server the database give me the results in 20 minutes,
but when i send to tableau online 1hs 40'
Im from Argentina.
i think too to do an incremental extract and not a complete.