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This allows gathering the WAL generation statistics for each statement execution. The three statistics that we collect are the number of WAL records, the number of full page writes and the amount of WAL bytes generated. This helps the users who have write-intensive workload to see the impact of I/O due to WAL. This further enables us to see approximately what percentage of overall WAL is due to full page writes. In the future, we can extend this functionality to allow us to compute the the exact amount of WAL data due to full page writes. This patch in itself is just an infrastructure to compute WAL usage data. The upcoming patches will expose this data via explain, auto_explain, pg_stat_statements and verbose (auto)vacuum output. Author: Kirill Bychik, Julien Rouhaud Reviewed-by: Dilip Kumar, Fujii Masao and Amit Kapila Discussion: https://postgr.es/m/CAB-hujrP8ZfUkvL5OYETipQwA=e3n7oqHFU=4ZLxWS_Cza3kQQ@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/.