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This is useful as a way for extensions to process COPY TO rows in the way they see fit (say auditing, analytics, backend, etc.) without the need to invoke an external process running as the OS user running the backend through PROGRAM that requires superuser rights. COPY FROM already provides a similar callback for logical replication. For COPY TO, the callback is triggered when we are ready to send a row in CopySendEndOfRow(), which is the same code path as when sending a row to a frontend or a pipe/file. A small test module, test_copy_callbacks, is added to provide some coverage for this facility. Author: Bilva Sanaba, Nathan Bossart Discussion: https://postgr.es/m/253C21D1-FCEB-41D9-A2AF-E6517015B7D7@amazon.com |
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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/.