I am rolling out the ArcGIS Enterprise products for testing. I am wondering what is the purpose of the datastore, if I already have an relational SQL enterprise database? The documentation makes it seem like just another database to store our data. Do I need the datastore at all? What benefits does it have over my current SDE database?
There are a number of benefits of setting up the ArcGIS Data Store, which will give you the base ArcGIS Enterprise deployment and additional functionality throughout the deployment. It's not a replacement of your SDE database. The following white paper goes into more detail about this: