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INSERT ... ON CONFLICT's precheck may have to wait on the outcome of another insertion, which may or may not itself be a speculative insertion. This wait is not necessarily associated with an exclusion constraint, but was always reported that way in log messages if the wait happened to involve a tuple that had no speculative token. Initially discovered through use of ON CONFLICT DO NOTHING, where spurious references to exclusion constraints in log messages were more likely. Patch by Peter Geoghegan. Reviewed by Julien Rouhaud. Back-patch to 9.5 where INSERT ... ON CONFLICT was added.
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/.