Big Data, its current applica

Think about this suggestion: These days, data warehousing and management technologies pose the biggest danger to personal privacy. Where does the government fall short in terms of data gathering and aggregation?

What are the best ways to clean up data? Also, what does "data quality" mean in terms of "big data"?

Please answer below questions based on this dimensional model and additional information provided     Q1: What is the maximum possible fact data volume in terms of record/row count? Answer:   Q3: The m:n ratio from attribute B3 to attribute B4 is changed from 1:3 to 1:1 due to some organizational changes. By how many times the maximum possible fact data volume (by record count) decreases? Answer: Q4: If there is an aggregate fact table at quarter dimension level with other attributes B4, C5 and A3. What is the maximum possible record count of this aggregate table as per the current state mentioned above? Answer: