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In btree and SP-GiST indexes, move the responsibility for calling IndexFreeSpaceMapVacuum from the vacuumcleanup phase to the bulkdelete phase, and do it if and only if we found some pages that could be put into FSM. As in commit 851a26e26, the idea is to make free pages visible to FSM searchers sooner when vacuuming very large tables (large enough to need multiple bulkdelete scans). This adds more redundant work than that commit did, since we have to scan the entire index FSM each time rather than being able to localize what needs to be updated; but it still seems worthwhile. However, we can buy something back by not touching the FSM at all when there are no pages that can be put in it. That will result in slower recovery from corrupt upper FSM pages in such a scenario, but it doesn't seem like that's a case we need to optimize for. Hash indexes don't use FSM at all. GIN, GiST, and bloom indexes update FSM during the vacuumcleanup phase not bulkdelete, so that doing something comparable to this would be a much more invasive change, and it's not clear it's worth it. BRIN indexes do things sufficiently differently that this change doesn't apply to them, either. Claudio Freire, reviewed by Masahiko Sawada and Jing Wang, some additional tweaks by me Discussion: https://postgr.es/m/CAGTBQpYR0uJCNTt3M5GOzBRHo+-GccNO1nCaQ8yEJmZKSW5q1A@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/.