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Question on Data Sharding

Hi,
If we are using NoSQL as has been mentioned in heading “Database Schema”, then why do we need to do sharding of that? As NoSQL would do the sharding part implicitly.
Please tell if I am missing something…

This lesson discusses general concepts as well for people who will not opt for NoSQL as well. So if someone does not choose NoSQL then how would they do sharding.

Will NoSQL do best or optimized sharding by itself?