Spring Data with John Blum
In the 1980s and the 1990s, most applications used only a relational database for their data management. In the early 2000s, software projects started to use an ever increasing number of data sources. MongoDB popularized the document database, which allows storage of objects that do not have a consistent schema. The Hadoop distributed file system enabled the redundant storage and efficient querying of high volumes of data that are spread
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