It is recommended to refer to the stress level of your own system. MongoDB itself has a strong ability to withstand pressure, so there is no need to add caching when it is not completely necessary, which can save a lot of development and operation and maintenance workload. It's not too late to add more when you really need it.
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Mongdb is used as the database, and Redis is used to cache the Top 10 popular data and Session. It is right
Mongodb is used as a persistent database, and redis is used as a memory cache database
It is recommended to refer to the stress level of your own system.
MongoDB itself has a strong ability to withstand pressure, so there is no need to add caching when it is not completely necessary, which can save a lot of development and operation and maintenance workload. It's not too late to add more when you really need it.