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In the first transaction run for REINDEX CONCURRENTLY, a thinko in the existing logic caused two session locks to be taken on the old index, causing the session lock on the newly-created index to be missed. This made possible concurrent DDL commands (like ALTER INDEX) on the new index while REINDEX CONCURRENTLY was processing from the point where the first internal transaction committed. This issue has been discovered while digging into another bug. Author: Michael Paquier Discussion: https://postgr.es/m/20191021074323.GB1869@paquier.xyz Backpatch-through: 12 |
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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: 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/.