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The previous text claimed that once the slot is disassociated with ALTER SUBSCRIPTION ... SET (slot_name = NONE), DROP SUBSCRIPTION "will no longer attempt any actions on a remote host". That is inaccurate: DROP SUBSCRIPTION may still connect to the publisher to drop internally-created table synchronization slots when some table synchronization is left unfinished. Reword to describe this, and note that if the publisher is unreachable those slots (and the main slot, if it still exists) must be dropped manually to avoid indefinitely reserving WAL. Reported-by: Jeff Davis <pgsql@j-davis.com> Author: Amit Kapila <amit.kapila16@gmail.com> Backpatch-through: 14 Discussion: https://postgr.es/m/CAA4eK1+tyYSpPxMBy1974kjivuGeR7YY=yopwRGrK3+vCTysdg@mail.gmail.com Discussion: https://postgr.es/m/D908370F-2695-4231-851D-17179A6A6F2A@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/.