Summary
The design of a database management system is affected by the CAP theorem. Relational databases and NoSQL databases are not rivals but complementary. One can utilize different database categories in a single software application. In certain scenarios, one can use the key-value store as a cache engine on top of the relational database to gain performance.
Relational and object-relational databases are the market-dominant databases. Relational databases are based on the concept of relation, and have a very robust mathematical model. Object-relational databases such as PostgreSQL overcome the limitations of relational databases by introducing complex data types, inheritance, and rich extensions.
Relational databases are based on the relation, ...
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