Abstract:Abstract-During the last few years, the revolution of social networks such as Facebook, Twitter, and Instagram led to a daily increasing of data that are heterogeneous in their sources, data models, and platforms. Heterogeneous data sources have many forms such as the www, deep web, relational databases systems, No-SQL database systems, hierarchal data systems, semistructured files, in which data are usually allocated on different machines (distributed) and have different data models (heterogeneous).Large-scal… Show more
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