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< o Reorder physical storage order to reduce padding? < < This involves having the user-specified order of columns < be different from the physical order. SELECT * would < need to reorder the physical values to match the < user-specified ordering. < < o Store disk pages with no alignment/padding? < < This necessitates adding CPU-required padding when moving < rows from disk to memory. < < One idea is to store the header in network byte order (high bits < first), and read the high bits to determine the header length. < http://archives.postgresql.org/pgsql-hackers/2006-09/msg00848.php > One idea is to create zero-or-one-byte-header versions > of varlena data types. In involves setting the high-bit and > 0-127 length in the single-byte header, or clear the high bit > and store the 7-bit ASCII value in the rest of the byte. > The small-header versions have no alignment requirements. > http://archives.postgresql.org/pgsql-hackers/2006-09/msg01372.php
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 including some of the more common listed below: C++ - http://thaiopensource.org/development/libpqxx/ JDBC - http://jdbc.postgresql.org ODBC - http://odbc.postgresql.org Perl - http://search.cpan.org/~dbdpg/ PHP - http://www.php.net Python - http://www.initd.org/ Ruby - http://ruby.scripting.ca/postgres/ Other language binding are available from a variety of contributing parties. PostgreSQL also has a great number of procedural languages available, a short but not complete list is below: PL/pgSQL - included in PostgreSQL source distribution PL/Perl - included in PostgreSQL source distribution PL/PHP - http://projects.commandprompt.com/projects/public/plphp PL/Python - included in PostgreSQL source distribution PL/Java - http://gborg.postgresql.org/project/pljava/projdisplay.php PL/Tcl - included in PostgreSQL source distribution 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/.