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This image shows a high-level diagram of the architecture for Data Gateway. Oracle Analytics Cloud communicates through a firewall with an on-premise database using HTTPS, with an agent installed in the on-premise environment that channels database queries between Oracle Analytics Cloud and the on-premise database. The callouts are 1. Oracle Analytics Cloud issues and queues queries. 2. The agent looks for queries to processs. 3. The agent executes the queries. 4. The agent sends the query results to Oracle Analytics Cloud.