mirror of
https://github.com/postgres/postgres.git
synced 2025-07-24 14:22:24 +03:00
97da48246d
Commit3d956d956allowed the COPY, but it's done by inserting individual rows to the foreign table, so it can be inefficient due to the overhead caused by each round-trip to the foreign server. To improve performance of the COPY in such a case, this patch allows batch insertion, by extending the multi-insert machinery in CopyFrom() to the foreign-table case so that we insert multiple rows to the foreign table at once using the FDW callback routine added by commitb663a4136. This patch also allows this for postgres_fdw. It is enabled by the "batch_size" option added by commitb663a4136, which is disabled by default. When doing batch insertion, we update progress of the COPY command after performing the FDW callback routine, to count rows not suppressed by the FDW as well as a BEFORE ROW INSERT trigger. For consistency, this patch changes the timing of updating it for plain tables: previously, we updated it immediately after adding each row to the multi-insert buffer, but we do so only after writing the rows stored in the buffer out to the table using table_multi_insert(), which I think would be consistent even with non-batching mode, because in that mode we update it after writing each row out to the table using table_tuple_insert(). Andrey Lepikhov, heavily revised by me, with review from Ian Barwick, Andrey Lepikhov, and Zhihong Yu. Discussion: https://postgr.es/m/bc489202-9855-7550-d64c-ad2d83c24867%40postgrespro.ru
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/.