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Introduce a new memory context which stores tuple data, and reset it at the end of each merge pass; this helps avoid memory fragmentation and, consequently, overallocation. Also, for the final merge patch, eliminate memory context chunk header overhead entirely by allocating all of the memory used for buffering tuples during the merge in a single chunk. Since this modestly increases the number of tuples we can store, grow the memtuples array a bit so that we're less likely to run short of slots there. Peter Geoghegan. Review and testing of patches in this series by Jeff Janes, Greg Stark, Mithun Cy, and me.
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/.
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