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This allows deadlock_timeout to be reduced for transactions that are particularly likely to be involved in a deadlock, thus detecting it more quickly. It is also potentially useful as a poor-man's deadlock priority mechanism: a transaction with a high deadlock_timeout is less likely to be chosen as the victim than one with a low deadlock_timeout. Since that could be used to game the system, we make this PGC_SUSET rather than PGC_USERSET. At some point, it might be worth thinking about a more explicit priority mechanism, since using this is far from fool-proof. But let's see whether there's enough use case to justify the additional work before we go down that route. Noah Misch, reviewed by Shigeru Hanada
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/.