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Hash partitioning is useful when you want to partition a growing data set evenly. This can be useful to keep table sizes reasonable, which makes maintenance operations such as VACUUM faster, or to enable partition-wise join. At present, we still depend on constraint exclusion for partitioning pruning, and the shape of the partition constraints for hash partitioning is such that that doesn't work. Work is underway to fix that, which should both improve performance and make partitioning pruning work with hash partitioning. Amul Sul, reviewed and tested by Dilip Kumar, Ashutosh Bapat, Yugo Nagata, Rajkumar Raghuwanshi, Jesper Pedersen, and by me. A few final tweaks also by me. Discussion: http://postgr.es/m/CAAJ_b96fhpJAP=ALbETmeLk1Uni_GFZD938zgenhF49qgDTjaQ@mail.gmail.com
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.