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On slow machines the modified test could end up switching the order in which transactional stats are reported in one session and non-transactional stats in another session. As stats handling of truncate is implemented as setting live/dead rows 0, the order in which a truncate's stats changes are applied, relative to normal stats updates, matters. The handling of stats for truncate hasn't changed due to shared memory stats, this is longstanding behavior. We might want to improve truncate's stats handling in the future, but for now just change the order of forced flushed to make the test stable. Reported-By: Christoph Berg <myon@debian.org> Discussion: https://postgr.es/m/YoZf7U/WmfmFYFEx@msg.df7cb.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/.