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Builds on 28e626bde00 and f30d62c2fc6. See the former for motivation. Rows of the view show IO operations for a particular backend type, IO target object, IO context combination (e.g. a client backend's operations on permanent relations in shared buffers) and each column in the view is the total number of IO Operations done (e.g. writes). So a cell in the view would be, for example, the number of blocks of relation data written from shared buffers by client backends since the last stats reset. In anticipation of tracking WAL IO and non-block-oriented IO (such as temporary file IO), the "op_bytes" column specifies the unit of the "reads", "writes", and "extends" columns for a given row. Rows for combinations of IO operation, backend type, target object and context that never occur, are ommitted entirely. For example, checkpointer will never operate on temporary relations. Similarly, if an IO operation never occurs for such a combination, the IO operation's cell will be null, to distinguish from 0 observed IO operations. For example, bgwriter should not perform reads. Note that some of the cells in the view are redundant with fields in pg_stat_bgwriter (e.g. buffers_backend). For now, these have been kept for backwards compatibility. Bumps catversion. Author: Melanie Plageman <melanieplageman@gmail.com> Author: Samay Sharma <smilingsamay@gmail.com> Reviewed-by: Maciek Sakrejda <m.sakrejda@gmail.com> Reviewed-by: Lukas Fittl <lukas@fittl.com> Reviewed-by: Andres Freund <andres@anarazel.de> Reviewed-by: Justin Pryzby <pryzby@telsasoft.com> Discussion: https://postgr.es/m/20200124195226.lth52iydq2n2uilq@alap3.anarazel.de
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/.