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Re:Major features of PostgreSQL 9.6 [pdf] by mianos on Monday September 26, 2016 @04:52AM (#12580293)
It is worth checking out the wiki on the details of the parallel query for how and when it works: https://wiki.postgresql.org/wiki/Parallel_Query
Re:Major features of PostgreSQL 9.6 [pdf] by amitlan on Tuesday September 27, 2016 @10:18AM (#12589722)
or read this chapter (the wiki page's content made into the official documentation): https://www.postgresql.org/docs/devel/static/parallel-query....