4楼 @brambles 这个大数据，还是有“数据规模大”的含义在吧。
wik百科的中英文解释
Big data is a broad term for data sets so large or complex that traditional data processing applications are inadequate. Challenges include analysis, capture, data curation, search, sharing, storage, transfer, visualization, and information privacy. The term often refers simply to the use of predictive analytics or other certain advanced methods to extract value from data, and seldom to a particular size of data set. Accuracy in big data may lead to more confident decision making. And better decisions can mean greater operational efficiency, cost reductions and reduced risk.
大數據（英语：Big data[1][2]或Megadata），或稱巨量資料、海量資料、大资料，指的是所涉及的資料量規模巨大到無法透過人工，在合理時間內達到擷取、管理、處理、並整理成為人類所能解讀的資訊[3][4]。在總資料量相同的情況下，與個別分析獨立的小型資料集（data set）相比，將各個小型資料集合併後進行分析可得出許多額外的資訊和資料關聯性，可用來察覺商業趨勢、判定研究品質、避免疾病擴散、打擊犯罪或測定即時交通路況等；這樣的用途正是大型資料集盛行的原因[5][6][7]。
sas 网站上的解释：
http://www.sas.com/en_us/insights/big-data/what-is-big-data.html
Big data is a popular term used to describe the exponential growth and availability of data, both structured and unstructured. And big data may be as important to business – and society – as the Internet has become. Why? More data may lead to more accurate analyses.
More accurate analyses may lead to more confident decision making. And better decisions can mean greater operational efficiencies, cost reductions and reduced risk.
还有个网站上的，我觉得也不错：
http://searchcloudcomputing.techtarget.com/definition/big-data-Big-Data
Big data is an evolving term that describes any voluminous amount of structured, semi-structured and unstructured data that has the potential to be mined for information. Although big data doesn't refer to any specific quantity, the term is often used when speaking about petabytes and exabytes of data.
以上解释里，我最倾向于最后一个。
