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When we cannot immediately acquire CLogControlLock in exclusive mode at commit time, we add ourselves to a list of processes that need their XIDs status update. We do this if the clog page where we need to update the current transaction status is the same as the group leader's clog page, otherwise, we allow the caller to clear it by itself. Now, when we can't add ourselves to any group, we were not clearing the current proc if it has already become a member of some group which was leading to an assertion failure when the same proc was assigned to another backend after the current backend exits. Reported-by: Alexander Lakhin Bug: 17072 Author: Amit Kapila Tested-By: Alexander Lakhin Backpatch-through: 11, where it was introduced Discussion: https://postgr.es/m/17072-2f8764857ef2c92a@postgresql.org |
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| configure | ||
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| README.git | ||
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/.