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Previously, we skipped a checkpoint if no WAL had been written since last checkpoint, though this does not appear in user documentation. As of now, we skip a checkpoint until we have written at least one enough WAL to switch the next WAL file. This greatly reduces the level of activity and number of WAL messages generated by a very low activity server. This is safe because the purpose of a checkpoint is to act as a starting place for a recovery, in case of crash. This patch maintains minimal WAL volume for replay in case of crash, thus maintaining very low crash recovery time.
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. Changes between all PostgreSQL releases are recorded in the file HISTORY. 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/.