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Date: Tue, 05 Nov 1996 00:24:45 GMTServer: NCSA/1.5Content-type: text/htmlLast-modified: Thu, 27 Jun 1996 19:46:28 GMTContent-length: 1257<html><HEAD><TITLE> OPT++ </TITLE></HEAD><BODY><P><HR> <P><H1>OPT++ </H1><P><em><!WA0><!WA0><!WA0><!WA0><a href="http://www.cs.wisc.edu/~navin/research/opt++.ps"> Opt++ </a></em> is a tool for Database Query Optimization that uses theObject-Oriented features of the C++ programming languageto simplify the task of implementing, extending and modifyingan optimizer. It incorporates all the features of of an extensibleoptimization framework including specification of a logical algebra,execution algorithms, logical and physical query processing alternatives,and selectivity and cost estimation.<p>Our goal was to extract out those parts of a query optimizer which are not dependent upon anyquery language and put together an extendible and flexible package with the intention of simplifying thetask of writing the query optimizer.We do not make any assumptions about thequery language and hence it is hoped that this toolcan be used to write query optimizers for a large class of query languages.<p>Opt++ is used in the <!WA1><!WA1><!WA1><!WA1><a href="http://www.cs.wisc.edu/paradise/paradise.html">Paradise</a> Parallel Database System.<P><!WA2><!WA2><!WA2><!WA2><a href="http://www.cs.wisc.edu/~navin/research/download/index.html">Download</a> OPT++ code.<HR><P><!WA3><!WA3><!WA3><!WA3><A HREF="http://www.cs.wisc.edu/~navin/navin.html"><b>Navin Kabra</b></a> (navin@cs.wisc.edu)</BODY>⌨️ 快捷键说明
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