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The variables newestCommitTs and oldestCommitTs sound as if they are timestamps, but in fact they are the transaction Ids that correspond to the newest and oldest timestamps rather than the actual timestamps. Rename these variables to reflect that they are actually xids: to wit newestCommitTsXid and oldestCommitTsXid respectively. Also modify related code in a similar fashion, particularly the user facing output emitted by pg_controldata and pg_resetxlog. Complaint and patch by me, review by Tom Lane and Alvaro Herrera. Backpatch to 9.5 where these variables were first introduced.
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: http://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 http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.