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When serialization or deadlock errors are reported by backend, allow to retry and continue the benchmarking. For this purpose new options "--max-tries", "--failures-detailed" and "--verbose-errors" are added. Transactions with serialization errors or deadlock errors will be repeated after rollbacks until they complete successfully or reach the maximum number of tries (specified by the --max-tries option), or the maximum time of tries (specified by the --latency-limit option). These options can be specified at the same time. It is not possible to use an unlimited number of tries (--max-tries=0) without the --latency-limit option or the --time option. By default the option --max-tries is set to 1, which means transactions with serialization/deadlock errors are not retried. If the last try fails, this transaction will be reported as failed, and the client variables will be set as they were before the first run of this transaction. Statistics on retries and failures are printed in the progress, transaction / aggregation logs and in the end with other results (all and for each script). Also retries and failures are printed per-command with average latency by using option (--report-per-command, -r). Option --failures-detailed prints group failures by basic types (serialization failures / deadlock failures). Option --verbose-errors prints distinct reports on errors and failures (errors without retrying) by type with detailed information like which limit for retries was violated and how far it was exceeded for the serialization/deadlock failures. Patch originally written by Marina Polyakova then Yugo Nagata inherited the discussion and heavily modified the patch to make it commitable. Authors: Yugo Nagata, Marina Polyakova Reviewed-by: Fabien Coelho, Tatsuo Ishii, Alvaro Herrera, Kevin Grittner, Andres Freund, Arthur Zakirov, Alexander Korotkov, Teodor Sigaev, Ildus Kurbangaliev Discussion: https://postgr.es/m/flat/72a0d590d6ba06f242d75c2e641820ec%40postgrespro.ru
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/.