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Previously, postgres_fdw's connection cache was keyed by user OID and server OID, but this can lead to multiple connections when it's not really necessary. In particular, if all relevant users are mapped to the public user mapping, then their connection options are certainly the same, so one connection can be used for all of them. While we're cleaning things up here, drop the "server" argument to GetConnection(), which isn't really needed. This saves a few cycles because callers no longer have to look this up; the function itself does, but only when establishing a new connection, not when reusing an existing one. Ashutosh Bapat, with a few small changes by me. |
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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: http://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 http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.