Intended Usage for Data Warehouse
Agile Data Warehousing Service is a relational database designed for data warehousing use cases. Although you can access Data Warehouse from any JDBC-capable client application and it supports a superset of the SQL:99 specification, Data Warehouse is expected to be used as a data warehouse and persistent staging environment.
Do not use Data Warehouse as an OLTP database with a large number of parallel queries and data updates with a very short expected response time.