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When there is both a serialization failure and a unique violation, throw the former rather than the latter. When initially pushed, this was viewed as a feature to assist application framework developers, so that they could more accurately determine when to retry a failed transaction, but a test case presented by Ian Jackson has shown that this patch can prevent serialization anomalies in some cases where a unique violation is caught within a subtransaction, the work of that subtransaction is discarded, and no error is thrown. That makes this a bug fix, so it is being back-patched to all supported branches where it is not already present (i.e., 9.2 to 9.5). Discussion: https://postgr.es/m/1481307991-16971-1-git-send-email-ian.jackson@eu.citrix.com Discussion: https://postgr.es/m/22607.56276.807567.924144@mariner.uk.xensource.com |
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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. 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/.