Step 3 design core components dive into details for each core component for example if you were asked to design a url shortening service discuss generating and storing a hash of the full url md5 and base62 hash collisions sql or nosql database schema translating a hashed url to the full url database lookup api and object oriented design step 4 scale the design identify and . Key features three phase design methodology covering conceptual database design logical database design and physical database design step by step approach introduces each stage of the database . A good example of a database design that avoids foreign key constraints is the system tables in most databases every major rdbms has a set of tables known as system tables these tables contain meta data information about user databases although there are relationships among these tables there is no foreign key relationship this is because the client in this case the database itself . Databases with tiny footprints eg rdm are optimized for edge computing embedded database an embedded database is the combination of a database and the database software which typically resides within an application the database holds information and the software control the database to access or store information the application software
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