> Additionally, the row limit is 2^20 which is the max number of rows that can be represented in a 32 bit system. I don't get it. Why is it the maximum? Also,

> Additionally, the row limit is 2^20 which is the max number of rows that can be represented in a 32 bit system. I don't get it. Why is it the maximum? Also, why 32 bit systems are still a concern?