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< * Allow star join optimizations < < While our bitmap scan allows multiple indexes to be joined to get < to heap rows, a star joins allows multiple dimension _tables_ to < be joined to index into a larger main fact table. The join is < usually performed by either creating a cartesian product of all < the dimmension tables and doing a single join on that product or < using subselects to create bitmaps of each dimmension table match < and merge the bitmaps to perform the join on the fact table. Some < of these algorithms might be patented. |
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aclocal.m4 | ||
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README.CVS |
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. The JDBC, ODBC, C++, Python, and Tcl interfaces have been moved to the PostgreSQL Projects Web Site at http://gborg.postgresql.org for separate maintenance. A Perl DBI/DBD driver is available from CPAN. 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 ftp://ftp.postgresql.org/pub/. For more information look at our web site located at http://www.postgresql.org/.