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An anti-wraparound vacuum has to be by definition aggressive as it needs to work on all the pages of a relation. However it can happen that due to some concurrent activity an anti-wraparound vacuum is marked as non-aggressive, which makes it redundant with a previous run, and it is actually useless as an anti-wraparound vacuum should process all the pages of a relation. This commit makes such vacuums to be skipped. An anti-wraparound vacuum not aggressive can be found easily by mixing low values of autovacuum_freeze_max_age (to control anti-wraparound) and autovacuum_freeze_table_age (to control the aggressiveness). 28a8fa9 has added some extra logging printing all the possible combinations of anti-wraparound and aggressive vacuums, which now gets simplified as an anti-wraparound vacuum also non-aggressive gets skipped. Per discussion mainly between Andrew Dunstan, Robert Haas, Álvaro Herrera, Kyotaro Horiguchi, Masahiko Sawada, and myself. Author: Kyotaro Horiguchi, Michael Paquier Reviewed-by: Andrew Dunstan, Álvaro Herrera Discussion: https://postgr.es/m/20180914153554.562muwr3uwujno75@alvherre.pgsql
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/.