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First, we shouldn't recommend switching to single-user mode, because that's terrible advice. Especially on newer versions where VACUUM will enter emergency mode when nearing (M)XID exhaustion, it's perfectly fine to just VACUUM in multi-user mode. Doing it that way is less disruptive and avoids disabling the safeguards that prevent actual wraparound, so recommend that instead. Second, be more precise about what is going to happen (when we're nearing the limits) or what is happening (when we actually hit them). The database doesn't shut down, nor does it refuse all commands. It refuses commands that assign whichever of XIDs and MXIDs are nearly exhausted. No back-patch. The existing hint that advises going to single-user mode is sufficiently awful advice that removing it or changing it might be justifiable even though we normally avoid changing user-facing messages in back-branches, but I (rhaas) felt that it was better to be more conservative and limit this fix to master only. Aside from the usual risk of breaking translations, people might be used to the existing message, or even have monitoring scripts that look for it. Alexander Alekseev, John Naylor, Robert Haas, reviewed at various times by Peter Geoghegan, Hannu Krosing, and Andres Freund. Discussion: http://postgr.es/m/CA+TgmoZBg95FiR9wVQPAXpGPRkacSt2okVge+PKPPFppN7sfnQ@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/.