In-memory query execution in Google BigQuery | Google Cloud Big Data and Machine Learning Blog  |  Google Cloud Platform

BigQuery is a fast petabyte-scale analytics database. To achieve that level of performance, BigQuery executes queries completely in memory. Most databases and data processing systems achieve scalability using hybrid executors that operate on both disk and memory. Meanwhile, BigQuery’s execution engine builds simple and purely in-memory operators and achieves petabyte-scale analytics through scalable data repartitioning, or “shuffle.” This post takes a closer look at BigQuery shuffle, and how it enables high performance, in-memory query execution by leveraging Google’s petabit-scale networking technologies, such as Jupiter.

Source: https://cloud.google.com/blog/big-data/2016/08/in-memory-query-execution-in-google-bigquery

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