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Non-relational databases might be the right choice if: •Your application requires super-low latency. •Your data are unstructured, or you do not have any relational data. •You only need to serialize and deserialize data (JSON, XML, YAML, etc.). •You need to store a massive amount of data.
follow: •Rounding and Approximation. It is difficult
If you are asked to design a news feed system, you want to ask questions that help you clarify the requirements. The conversation between you and the interviewer might look like this:
Token bucket algorithm
Most use
The Open Systems Interconnection model (OSI model) has 7 layers
