Everything about Data Store Object(DSO)

In SAP BI 7.0, we have three types of DSO's they are 


1) Standard DSO
2) Direct Update DSO
3) Write Optimized DSO


The below three articles will give clear information about these three DSO's. It give information about the difference between DSO's and activation process in standard DSO.


Check the below articles
UNDERSTANDING DSO (DATASTORE OBJECT) PART 1: STANDARD DSO
UNDERSTANDING DSO (DATASTORE OBJECT) PART 2: WRITE-OPTIMIZED DSO
UNDERSTANDING DSO (DATASTORE OBJECT) PART 3: DIRECT UPDATE DSO