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The original advice for hard-wired SetConfigOption calls was to use PGC_S_OVERRIDE, particularly for PGC_INTERNAL GUCs. However, that's really overkill for PGC_INTERNAL GUCs, since there is no possibility that we need to override a user-provided setting. Instead use PGC_S_DYNAMIC_DEFAULT in most places, so that the value will appear with source = 'default' in pg_settings and thereby not be shown by psql's new \dconfig command. The one exception is that when changing in_hot_standby in a hot-standby session, we still use PGC_S_OVERRIDE, because people felt that seeing that in \dconfig would be a good thing. Similarly use PGC_S_DYNAMIC_DEFAULT for the auto-tune value of wal_buffers (if possible, that is if wal_buffers wasn't explicitly set to -1), and for the typical 2MB value of max_stack_depth. In combination these changes remove four not-very-interesting entries from the typical output of \dconfig, all of which people fingered as "why is that showing up?" in the discussion thread. Discussion: https://postgr.es/m/3118455.1649267333@sss.pgh.pa.us
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/.