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Post date: Oct 11, 2013 3:19:17 PM
When you create a table in Greenplum Database, it is important to declare a distribution key that allows for even data distribution across all segments in the system. Because the segments work on a query in parallel, Greenplum Database will always be as fast as the slowest segment. If the data is unbalanced, the segments that have more data will return their results slower.