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Commit0e141c0fbbintroduced a new facility to reduce ProcArrayLock contention by clearing several XIDs from the ProcArray under a single lock acquisition. The names initially chosen were deemed not to be very good choices, so commit4aec49899erenamed them. But now it seems like we still didn't get it right. A pending patch wants to add similar infrastructure for batching CLOG updates, so the names need to be clear enough to allow a new set of structure members with a related purpose. Amit Kapila
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/.