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When building hash indexes using the spool method, tuples are added to the index page in hashkey order. Because of this, we can safely skip performing the binary search on the existing tuples on the page to find the location to insert the tuple based on its hashkey value. For this case, we can just always put the tuple at the end of the item array as the tuples will always arrive in hashkey order. Testing has shown that this can improve hash index build speeds by 5-15% with a unique set of integer values. Author: Simon Riggs Reviewed-by: David Rowley Tested-by: David Zhang, Tomas Vondra Discussion: https://postgr.es/m/CANbhV-GBc5JoG0AneUGPZZW3o4OK5LjBGeKe_icpC3R1McrZWQ@mail.gmail.com |
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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/.