It is extremely common for applications to store various pieces of information, most of the time in relational databases. While they do a great job when working with regular data types, they are not very efficient when dealing with binary data, for example images or documents. File systems can be used as an alternative and while they offer better performance, there is neither a query language for searching information nor a notion of relationship or transaction.
Allowing third parties access to the stored data (a typical requirement that arrises as the application grows) is, in many cases, a lengthy and complex process which can not happen overnight. The internal structure of the storage can easily affect the API architecture and the way information is retrieved and traversed.
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