The RDF-3X engine for scalable management of RDF data----part2
本文由學者Thomas Neumann和Gerhard Weikum於2009/09/01在《The VLDB Journal 》聯合發表 原文下載鏈接文末自取 選擇性估計： 查詢優化器依靠成本模型查找成本最低的執行計劃，由於估計的基數及選擇性對計劃生成影響巨大，所以提出如下兩種統計方法： 專用直方圖，可處理任何類型的三重模式和聯接，缺點是假設謂詞間具有獨立性，則謂詞不包含在緊密耦合的三元模式。
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