From high-availability.sgml:
Clustering For Parallel Query Execution
This allows multiple servers to work concurrently on a single query. One possible way this could work is for the
datato be split among servers and for each server to execute its part of the query and results sent to a central
serverto be combined and returned to the user. There currently is no PostgreSQL open source solution for this.
I think pgpool-II can do this.
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Tatsuo Ishii
SRA OSS, Inc. Japan
