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<td align="center" valign="middle" class="til"><h3> Analysis Services 2005數據完整性處理 </h3>
發布時間:2007-12-26 來源:網絡/責編:編程入門 作者:佚名<br />
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</table><p> 數據完整性在關系數據庫應用的比較廣泛,特別是在OLTP系統中,但在ETL和加載數據到數據倉庫(DW)時,缺乏提供數據完整性的通常處理,然在SSAS中,數據庫管理員可以非常方便的處理這些問題。在SSAS中,可以通過空值處理和錯誤配置來設置數據完整性處理,其中空值處理和錯誤配置都和未知成員有關。下面就未知成員、空處理、錯誤配置的一些基本概念分別介紹。</p>
<p> 1、未知成員</p>
<p> SSAS中,維度對象有一個稱為UnknownMember的屬性,它可取的值為:values—None, Hidden, Visible</p>
<p> 當為Hidden/Visible值時,SSAS自動的為維度的每一個屬性建立一個稱為 Unknown Member 的成員</p>
<p> 當值為Hidden時,指示這個成員將在結果中隱藏</p>
<p> 缺省的取值為 None</p>
<p> 如果你想改變未知成員的名字,可以修改維度的UnknownMemberName屬性</p>
<p> 2、空處理</p>
<p> 空處理指定當遭遇空數據時如何處理,它有下面5中可能的值</p>
<p> ZeroOrBlank —這個選擇告訴服務器轉換NULL為0或者空值‘’</p>
<p> Preserve—這個選項告訴服務器保留NULL.服務器會把它當作其他值一樣處理</p>
<p> Error—這個選項告訴服務器說明NULL值為非法的數據項.服務器將產生一個數據完整性錯誤</p>
<p> UnknownMember—這選項告訴服務器以把NULL值作為一個未知的成員處理.但也將產生一個數據完整性錯誤.它只被應用于作為鍵列的屬性</p>
<p> Default—這是一個條件選項,在維度和CUBE中,它的值為ZeroOrBlank,在挖掘結構和模型中,它的值為UnknownMember<center>共3頁: 上一頁 1 <a href='6357_2.htm'>[2]</a> <a href='6357_3.htm'>[3]</a> <a href='6357_2.htm'>下一頁</a> <br /><script src="/js1/4682.js"></script></center>
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