Thank you Lars.
I read few documents and watched few videos on SDI and below is my understanding:
1. SDI is another ETL tool.
2. It uses remote sources (SDA) to read data from different sources (Oracle, SQL, HADOOP, HANA.....).and a SQL procedure gets generated for each data load. Once the data is read using remote source, using SDI transformations data can be loaded into a physical table. In previous versions where SDI was not there, data can only be read virtually using SDA concept. SDI is smart enough to do initial load for the first time and delta's there after. So effective performance booster for remote data reads.
3. Different Transformations can be applied to the incoming data using SDI tool and store the data in a table.
4. With SDI, we dont really need SLT and BODS anymore. SDI combines real time capability of SLT and transformations capability of BODS into 1.
5. Can create JAVA Adapters for different source system connections.
Let me know if im wrong in any!