There is no definite answer to this question but based on recent practices all around the industry in the big data field, the entry-level criteria for data to be considered as big data is around 1 TB.
Frameworks like Hadoop are used for this purpose. It can be noted that big data analytics can be used for smaller databases as well when mathematical operations are concerned. R and Python are also in wide use when integrated with Big Data technologies for the same purposes.
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