SAP HANA Smart Data Access enables easy access to remote data, without copying the data into SAP HANA, so it feels like you are accessing a local table in SAP HANA.
Data Access helps to integrate data from multiple systems in real time regardless of where the data is located. With SDA, you can create virtual tables in SAP HANA that point to remote tables in different data sources, giving complete operatiability to these tables via SQL queries. The following diagram explains the flexibility and operatabilty of SAP SDA:
SAP HANA Smart Data Access supports the following databases (as of SAP HANA SP08):