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Previously stats in the startup process would only get reported during shutdown of the startup process. It has been that way for a long time, but became a lot more noticeable with the new pg_stat_io view, which separates out IO done by different backend types... While replaying after every XLOG_RUNNING_XACTS isn't the prettiest approach, it has the advantage of being quite easy. Given that we're well past feature freeze... It's not a problem that we don't report stats more frequently with wal_level=minimal, in that case stats can't be read before the stats process has shut down. Besides the above, this commit also changes pgstat_report_stat() to acquire the timestamp with GetCurrentTimestamp() instead of GetCurrentTransactionStopTimestamp(). Thanks to Melih Mutlu, Kyotaro Horiguchi for prototypes of other approaches to solving this issue. Reported-by: Fujii Masao <masao.fujii@oss.nttdata.com> Discussion: https://postgr.es/m/5315aedc-fbca-1556-c5de-dc2e00b23a14@oss.nttdata.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/.