Hybrid data distribution in a massively parallel processing architecture

摘要

System and method for hybrid distribution mode in massively parallel processing (MPP) database preventing storage imbalance issues caused by data skew. Key values of the database are identified as outliers if records of those keys cause database skew. In hybrid mode, records having the outlier key values are distributed using a random distribution scheme. Other records are distributed using a hash distribution scheme. A threshold skew amount is configurable for the system. Record lookups, insertions, deletions, and updates are processed according to a query plan optimized for the distribution mode of the records referenced in a database query.