It is normal that data in delta storage requires more memory than the same data in main storage because of less efficient compression. Nevertheless I would not expect this massive increase from only updating four columns. I would recommend you to run SQL: "HANA_Memory_TopConsumers_Rev60+" (SAP Note 1969700) during the execution of the UPDATE in order to understand which column store or heap areas grow so much. Feel free to provide the output in this thread so that I can have a look.
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