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Previously, the speculative insert tests did not cover the case when a tuple t is inserted into a table with a unique index on a column but before it can insert into the index, a concurrent transaction has inserted a conflicting value into the index and the insertion of tuple t must be aborted. The basic permutation is one session successfully inserts into the table and an associated unique index while a concurrent session successfully inserts into the table but discovers a conflict before inserting into the index and must abort the insertion. Several variants on this include: - swap which session is successful - first session insert transaction does not commit, so second session must wait on a transaction lock - first session insert does not "complete", so second session must wait on a speculative insertion lock Also, refactor the existing TOAST table upsert test to be in the same spec and reuse the steps. Author: Melanie Plageman, Ashwin Agrawal, Andres Freund Reviewed-by: Andres Freund, Taylor Vesely Discussion: https://postgr.es/m/CAAKRu_ZRmxy_OEryfY3G8Zp01ouhgw59_-_Cm8n7LzRH5BAvng@mail.gmail.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/.