How do I use RDB and key-value DB differently?
Personally, I understand the difference between whether or not you can create an index later, but is this correct?
First, use a complete transaction mechanism if there is no reasonable mechanism.
The result is a well-worn RDB.
If the RDB alone does not meet the required performance for the system you are trying to create, use some different mechanisms.
At that time, if it's real-time, KeyValueStore, etc., and if it's non-real-time, it's column-oriented DB, and so on, NoSQL will be the candidate.
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