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2PC state info is written only to WAL at PREPARE, then read back from WAL at COMMIT PREPARED/ABORT PREPARED. Prepared transactions that live past one bufmgr checkpoint cycle will be written to disk in the same form as previously. Crash recovery path is not altered. Measured performance gains of 50-100% for short 2PC transactions by completely avoiding writing files and fsyncing. Other optimizations still available, further patches in related areas expected. Stas Kelvich and heavily edited by Simon Riggs Based upon earlier ideas and patches by Michael Paquier and Heikki Linnakangas, a concrete example of how Postgres-XC has fed back ideas into PostgreSQL. Reviewed by Michael Paquier, Jeff Janes and Andres Freund Performance testing by Jesper Pedersen
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/.