Speeding up SQL transfer over a network

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Speeding up SQL transfer over a network



I have two SQL environments, data warehouse which collects data and a datamart which people access for a subset of the data, each with their own SQL 2016 databases. I run a script which pulls out data, transforms it and transfer it from the data warehouse to the datamart using Linked Servers. The entire process takes around 60+ hours to run. I want to avoid at all costs at having the data warehouse data in the datamart.



I experimented to see why the whole process was taking so long. I did a backup of the data warehouse, restored it onto the datamart and ran the import script and the entire process took around 3 hours to run. The script itself to 1.5 hours, telling me of the 60+ hours its the linked server transfer of data between the two servers that is the slowest part. I've pretty much ruled out network speed or issues between the two servers; this is all SQL. I'm trying to avoid having to write an application to do all of this in .NET if I can keep it in SQL.



Does anyone have any suggestions on how to improve performance time between SQL transfers?









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