The previous KDnuggets Poll asked:
What was the largest database or dataset you data-mined / analyzed?
Based on almost 300 responses, we estimate the median in 6 - 10 GB range.
Amazingly, 32% of respondents reported analyzing databases over 100 GB,
and 18% - over 1 Terabyte. New in this poll was a petabyte (1,000,000 GB) range and 12 people had worked with such humongous databases.
Here are the full results of
KDnuggets 2010 Poll: Largest Database Data Mined / Analyzed
Below is a breakdown of responses by region.
Largest Database Data Mined/ Analyzed by region
Note that Asia and Australia/New Zealand have a higher proportion of terabyte/petabyte data miners than the US and Europe.
For comparison, a similar 2009 poll, What was the largest database or dataset you data-mined?, had the median answer in slighly larger 10-20 GB range (probably because fewer people participated in 2009).
However, in 2009 only 20% had experience working with over over 100 GB databases, and only 10% had experience working with over 1 Terabyte databases.