Why using databases (RDMS) couldn't handle big data....
Before today's technology, databases were used to store data but this method could no longer continue for big data because the size of big data is too large for normal databases to handle. Big data is very large - it can be up to petabytes in size. Traditional databases were not designed to hold this vast amount of information. They also cannot filter out the data from the unstructured data as most of big data is unstructured. It would only make sense to hold data in a database if it was structured and it is less common to find structured data ready for a database. Big data usually needs to be processed in real-time because there is so much of it. Databases are too slow to keep up with this speed of information flow.
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