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System Architecture of a bank?

Sachin Kalsi's photo
Sachin Kalsi
·Sep 19, 2017

Assume that there is a bank which has more than 5 billion customers, 0.5 billion customers login to the online portal to do the usual transactions.

How would be the system architecture for such a bank ? How they achieve sharding on the DB (since banks uses SQL, I am interested in this specific part)?