73d1bfd0b5
Force the transaction isolation level to READ COMMITTED in autovacuum worker and launcher processes. There is no benefit to using a higher isolation level, and doing so could result in delaying foreground transactions (or maybe even causing unnecessary serialization failures?). Noted by Dan Ports. Also, make sure we disable zero_damaged_pages and statement_timeout in the autovac launcher, not only workers. Now that the launcher can run transactions, these settings could affect its behavior, and it seems like the same arguments apply to the launcher as the workers.
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. Changes between all PostgreSQL releases are recorded in the file HISTORY. 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/.