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relation extension lock. The only exception to the rule is that we can try to acquire the same relation extension lock more than once. This is allowed as we are not creating any new lock for this case. This restriction implies that the relation extension lock won't ever participate in the deadlock cycle because we can never wait for any other heavyweight lock after acquiring this lock. Such a restriction is okay for relation extension locks as unlike other heavyweight locks these are not held till the transaction end. These are taken for a short duration to extend a particular relation and then released. Author: Dilip Kumar, with few changes by Amit Kapila Reviewed-by: Amit Kapila, Kuntal Ghosh and Sawada Masahiko Discussion: https://postgr.es/m/CAD21AoCmT3cFQUN4aVvzy5chw7DuzXrJCbrjTU05B+Ss=Gn1LA@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/.