--Routing → Controller → Model → View --Create database-> Edit database.yml-> rails db: create-> Restart local server --Reason for restarting local server --If you edit in the development environment such as "Change Ruby version", "Change table / column information", "Change Gem installation status", these information will be read only once when the local server is started. --RDB is a relational database. Database that manages data in tabular format --RDBMS is a system that manages RDB. Point to -d mysql attached to the option with the rails new command --MY SQL is one of RDBMS. The features are high expandability, handling of small to large-scale data is ok, and highly flexible.
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