DB sharding is an important concept in the system design and a topic that is brought up often during interviews. No matter what you are specialized in, front-end, infra, or mobile. This is something worth having a decent understanding.

Definition

Sharding is to split data into smaller chunks(or shards), where each shard can be on different machines.

Why Sharding?

• Data is too large to hold everything into one table on one mache. For example, users’ tweets, there are millions of new tweets generated everyday.
• System need distributed processing to speed up data handling performance

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