File system, for me its much more scalable
thats very slow way to save file data in database . in small and security project is able to save identity doc in db . in other project best way is save file on disk . in very large project like social network , several way is available : a-store by apache hive and hadop and spark b-store by amazon s3 engin c-soter in google big file system ,.... that ways is hardly implemented but scalable and very fast and secure.
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