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Reclaim space from the line pointer array when heap pruning leaves behind a contiguous group of LP_UNUSED items at the end of the array. This happens during subsequent page defragmentation. Certain kinds of heap line pointer bloat are ameliorated by this new optimization. Follow-up work to commit 3c3b8a4b26, which taught VACUUM to truncate the line pointer array in about the same way during VACUUM's second pass over the heap. We now apply line pointer array truncation during both the first and the second pass over the heap made by VACUUM. We can also perform line pointer array truncation during opportunistic pruning. Matthias van de Meent, with small tweaks by me. Author: Matthias van de Meent <boekewurm+postgres@gmail.com> Discussion: https://postgr.es/m/CAEze2WjgaQc55Y5f5CQd3L=eS5CZcff2Obxp=O6pto8-f0hC4w@mail.gmail.com Discussion: https://postgr.es/m/CAEze2Wg36%2B4at2eWJNcYNiW2FJmht34x3YeX54ctUSs7kKoNcA%40mail.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/.