By user702295-Oracle on Oct 26, 2013
to create a new index instead of changing the PK.
For example, if my PK on SALES_DATA is (ITEM_ID, LOCATION_ID, SALES_DATE) and I decide partition by SALES_DATE, then I should add an index starting
with the partition key like this: (SALES_DATE, ITEM_ID, LOCATION_ID).
* Note that the first column of the new index matches the partition key.
It might also be helpful to create a 2nd index with the other PK columns reversed (SALES_DATE, LOCATION_ID, ITEM_ID). Again, the first column
matches the partition key.