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DXC w/ Sidecar vs. BW on HANA

I'm traditional BW consultant trying to understand HANA technologies. My question is specifically concerned regarding separate ECC and separate BW on HANA installations....

I read about DXC w/ sidecar approach where we can use separate BW box to route datasource data to HANA. This is also possible with BW on HANA where BW on HANA data source activation queue gets redirected to In memory DSO.

How is this different than just having regular data sources in BW on HANA and then load data from data sources to In memory DSOs? I don't think there's any performance increase while loading data with DXC into BW on HANA.....So why take so much pain configuring DXC if you already have BW on HANA with established ALE IDOC connections between ECC and BW....

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