1) Interview Questions on Big Data
1. What is the difference between Hadoop and Traditional RDBMS? Hadoop vs RDBMS Criteria Hadoop RDBMS Datatypes Processes semi-structured and unstructured data. Processes structured data. Schema Schema on Read Schema on Write Best Fit for Applications Data discovery and Massive Storage/Processing of Unstructured data. Best suited for OLTP and complex ACID transactions. Speed Writes are Fast Reads are Fast 2. What do the four V’s of Big Data denote? The four critical features of big data: a) Volume –Scale of data b) Velocity –Analysis of streaming data c) Variety – Different forms of data d) Veracity –Uncertainty of data 3. How big data analysis helps businesses increase their revenue? Give example. Big data analysis is helping businesses differentiate themselves – for example Walmart the world’s largest retailer in 2014 in terms of revenue - is using big data analytics to increase its sales through better predictive analytics, providing cu...