e1477db921
On further reflection, code comments added by commit b0229f26 slightly misrepresented how we determine the oldest bpto.xact for the index. btvacuumpage() does not treat the bpto.xact of a page that it put in the FSM as a candidate to be the oldest deleted page (the delete-marked page that has the oldest bpto.xact XID among all pages encountered). The definition of a deleted page for the purposes of the bpto.xact calculation is different from the definition used by the bulk delete statistics. The bulk delete statistics don't distinguish between pages that were deleted by the current VACUUM, pages deleted by a previous VACUUM operation but not yet recyclable/reusable, and pages that are reusable (though reusable pages are counted separately). Backpatch: 11-, just like commit b0229f26.
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/.