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When SSI was developed, slru.c was limited to segment files with names in the range 0000-FFFF. This didn't allow enough space for predicate.c to store every possible XID when spilling old transactions to disk, so it would wrap around sooner and print warnings. Since commits 638cf09e and 73c986ad increased the number of segment files slru.c could manage, that behavior is unnecessary. Therefore remove that code. Also remove the macro OldSerXidSegment, which has been unused since 4cd3fb6e. Thomas Munro, reviewed by Anastasia Lubennikova Discussion: https://postgr.es/m/CAEepm=3XfsTSxgEbEOmxu0QDiXy0o18NUg2nC89JZcCGE+XFPA@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/.