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RecentXmin (== MyProc->xmin). This ensures that it will be safe to truncate pg_subtrans at RecentGlobalXmin, which should largely eliminate any fear of bloat. Along the way, eliminate SubTransXidsHaveCommonAncestor, which isn't really needed and could not give a trustworthy result anyway under the lookback restriction. In an unrelated but nearby change, #ifdef out GetUndoRecPtr, which has been dead code since 2001 and seems unlikely to ever be resurrected.
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 several language bindings, including C and Tcl. The JDBC, ODBC, C++, and Python interfaces have been moved to the PostgreSQL Projects Web Site at http://gborg.postgresql.org for separate maintenance. A Perl DBI/DBD driver is available from CPAN. 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. Changes between all PostgreSQL releases are recorded in the file HISTORY. 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 ftp://ftp.postgresql.org/pub/. For more information look at our web site located at http://www.postgresql.org/.