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This is useful for monitoring purposes with log parsing. Similarly to pg_stat_activity, the leader's PID is shown only for active parallel workers, minimizing the log footprint for the leaders as the equivalent shared memory field is set as long as a backend is alive. Author: Justin Pryzby Reviewed-by: Álvaro Herrera, Michael Paquier, Julien Rouhaud, Tom Lane Discussion: https://postgr.es/m/20200315111831.GA21492@telsasoft.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/.