From the story of Heer Seng and Ah Fei（in class Database Management System (2/2561)）, we know about evolution of database tech.
start from record data by pen and paper until lasted technology of database is cloud database. i realize that each generation have advantages and disadvantages . which one is more than another if it have more than another. then people will develop the technology for get rid of disadvantage and add more advantage.
Lasted technology of database is cloud; A cloud database is a database service built and accessed through a cloud platform. It serves many of the same functions as a traditional database with the added flexibility of cloud computing. Users install software on a cloud infrastructure to implement the database. it's seem good enough? answer is not ..
because cloud database is very expensive although client don't hire the expert for maintenance but the size is cost much.So, i think , what if we reduce the size of file in cloud and implement at the same address but in the another size . that action for reduce the cost of size in cloud.
I think JSON .
it is a way to represent data thats very popular with developers,
Now developers can store JSON data naively as columns in Oracle Database. By using enhanced SQL to access JSON data more easily, database pros can do any relational database task with that data. If you look at NoSQL databases, they kind of had two technologies that were really interestingone was sharding, the other was JSON, Loaiza says. Weve now introduced those into relational databases.
concluding, although cloud database is the best database in nowadays but what if in the future we eliminate cons and step in to the next generation .