No option to choose Regional VNET or Affinity for new DocumentDB

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I tried to setup Affinity or Regional VNET in Azure preview portal for new DocumentDB. I can setup this from normal portal, however I am interested in placing DocumentDB and Virtual Machine close to each other so the latency is minimal.

I tried to do it without above. I placed VM and DB in the same region - West US. However latency is huge, about 45 msec. Is it a feature of this new DocumentDB or I just doing something completely wrong?

Thank you John

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David Makogon On

DocumentDB is a service and not a VM that you control. You cannot choose an affinity group. You can only choose the region in which your database instance will be instantiated.