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Commit9f3665fbremoved the vacuum_cleanup_index_scale_factor storage parameter. However, that creates dump/reload hazards when moving across major versions. Add back the vacuum_cleanup_index_scale_factor parameter (though not the GUC of the same name) purely to avoid problems when using tools like pg_upgrade. The parameter remains disabled and undocumented. No backpatch to Postgres 13, since vacuum_cleanup_index_scale_factor was only disabled by REL_13_STABLE's version of master branch commit9f3665fbin the first place -- the parameter already looks like this on REL_13_STABLE. Discussion: https://postgr.es/m/YEm/a3Ko3nKnBuVq@paquier.xyz
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/.