博客园_WinkSky .NETJust do it.http://feed.cnblogs.com/blog/u/15323/rss2010-08-30T00:17:05ZWinkSkyhttp://www.cnblogs.com/winksky/CNBlogs BlogServerhttp://www.cnblogs.com/winksky/archive/2010/08/30/1812289.html索引2.性质及使用方法 1)聚集索引：表中存储的数据按照索引的顺序存储，检索效率比普通索引高，索引占用硬盘 存储空间小（1%左右），但对数据新增/修改/删除的速度影响比较大（降低）。 特点： (1) 无索引，数据无序 (2) 有索引，数据与索引同序 (3) 数据会根据索引键的顺序重新排列数据 (4) 一个表只能有一个索引 (5) 叶节点的指针指向的数据也在同一位置存储 语法：create CLUSTE...2010-08-30T00:17:00Z2010-08-30T00:17:00ZWinkSkyhttp://www.cnblogs.com/winksky/
<p style="margin: 0in; color: black; font-size: 10.5pt"><span style="font-family: verdana"> 2.</span><span style="font-family: 宋体">性质及使用方法</span></p>
<p style="margin: 0in; color: black; font-size: 10.5pt"><span style="font-family: verdana"> 1)</span><span style="font-family: 宋体">聚集索引：表中存储的数据按照索引的顺序存储，检索效率比普通索引高，索引占用硬盘</span></p>
<p style="margin: 0in; color: black; font-size: 10.5pt"><span style="font-family: verdana"> </span><span style="font-family: 宋体">存储空间小（</span><span style="font-family: verdana">1%</span><span style="font-family: 宋体">左右），但对数据新增</span><span style="font-family: verdana">/</span><span style="font-family: 宋体">修改</span><span style="font-family: verdana">/</span><span style="font-family: 宋体">删除的速度影响比较大（降低）。</span></p>
<p style="margin: 0in; color: black; font-size: 10.5pt"><span style="font-family: verdana"> </span><span style="font-family: 宋体">特点：</span></p>
<p style="margin: 0in; color: black; font-size: 10.5pt"><span style="font-family: verdana"> (1) </span><span style="font-family: 宋体">无索引，数据无序</span></p>
<p style="margin: 0in; color: black; font-size: 10.5pt"><span style="font-family: verdana" lang="en-US"> (2) </span><span style="font-family: 宋体" lang="en-US">有索引，数据与索引同序</span><span style="font-family: verdana" lang="zh-CN"> </span></p>
<p style="margin: 0in; color: black; font-size: 10.5pt"><span style="font-family: verdana"> (3) </span><span style="font-family: 宋体">数据会根据索引键的顺序重新排列数据</span></p>
<p style="margin: 0in; color: black; font-size: 10.5pt"><span style="font-family: verdana"> (4) </span><span style="font-family: 宋体">一个表只能有一个索引</span></p>
<p style="margin: 0in; color: black; font-size: 10.5pt"><span style="font-family: verdana"> (5) </span><span style="font-family: 宋体">叶节点的指针指向的数据也在同一位置存储</span></p>
<p style="margin: 0in"><span style="font-family: verdana; color: black; font-size: 10.5pt"> </span><span style="font-family: 宋体; color: black; font-size: 10.5pt">语法：</span><span style="font-family: verdana; color: black; font-size: 10.5pt">create CLUSTERED INDEX idxempID ON emp(empID)</span><span style="font-family: Calibri; font-size: 11pt"> </span></p>
<p style="margin: 0in; font-family: Calibri; font-size: 11pt"></p>
<p style="margin: 0in; color: black; font-size: 10.5pt"><span style="font-family: verdana"> 2)</span><span style="font-family: 宋体">非聚集索引：不影响表中的数据存储顺序，检索效率比聚集索引低，索引占用硬盘存储</span></p>
<p style="margin: 0in; color: black; font-size: 10.5pt"><span style="font-family: verdana"> </span><span style="font-family: 宋体">空间大（</span><span style="font-family: verdana">30%~40%</span><span style="font-family: 宋体">），对数据新增</span><span style="font-family: verdana">/</span><span style="font-family: 宋体">修改</span><span style="font-family: verdana">/</span><span style="font-family: 宋体">删除的影响很少。</span></p>
<p style="margin: 0in; color: black; font-size: 10.5pt"><span style="font-family: verdana"> </span><span style="font-family: 宋体">特点：</span></p>
<p style="margin: 0in; color: black; font-size: 10.5pt"><span style="font-family: verdana"> (1) </span><span style="font-family: 宋体">一个表可以最多可以创建</span><span style="font-family: verdana">249</span><span style="font-family: 宋体">个非聚集索引</span></p>
<p style="margin: 0in; color: black; font-size: 10.5pt"><span style="font-family: verdana"> (2) </span><span style="font-family: 宋体">先建聚集索引才能创建非聚集索引</span></p>
<p style="margin: 0in; color: black; font-size: 10.5pt"><span style="font-family: verdana"> (3) </span><span style="font-family: 宋体">非聚集索引数据与索引不同序</span></p>
<p style="margin: 0in; color: black; font-size: 10.5pt"><span style="font-family: verdana"> (4) </span><span style="font-family: 宋体">数据与非聚集索引在不同位置</span></p>
<p style="margin: 0in; color: black; font-size: 10.5pt"><span style="font-family: verdana"> (5) </span><span style="font-family: 宋体">非聚集索引在叶节点上存储，在叶节点上有一个“指针”直接指向要查询的数据区域</span></p>
<p style="margin: 0in; color: black; font-size: 10.5pt"><span style="font-family: verdana"> (6) </span><span style="font-family: 宋体">数据不会根据非聚集索引键的顺序重新排列数据</span></p>
<p style="margin: 0in"><span style="font-family: verdana; color: black; font-size: 10.5pt"> </span><span style="font-family: 宋体; color: black; font-size: 10.5pt">语法：</span><span style="font-family: verdana; color: black; font-size: 10.5pt">create NONCLUSTERED INDEX idximpID ON emp(empID)</span><span style="font-family: Calibri; font-size: 11pt"> </span></p>
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<p style="margin: 0in; color: black; font-size: 10.5pt"><span style="font-family: 宋体">动作描述</span><span style="font-family: verdana">/</span><span style="font-family: 宋体">是否应该</span></p></td>
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<p style="margin: 0in; font-family: 宋体; color: black; font-size: 10.5pt">使用聚集索引</p></td>
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<p style="margin: 0in; color: black; font-size: 10.5pt"><span style="font-family: 宋体">使用非聚集索引</span><span style="font-family: verdana"> </span></p></td></tr>
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<p style="margin: 0in; font-family: 宋体; color: black; font-size: 10.5pt">列经常被分组排序</p></td>
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<p style="margin: 0in; font-family: 宋体; color: black; font-size: 10.5pt">应</p></td>
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<p style="margin: 0in; font-family: 宋体; color: black; font-size: 10.5pt">应</p></td></tr>
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<p style="margin: 0in; font-family: 宋体; color: black; font-size: 10.5pt">返回某范围内的数据</p></td>
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<p style="margin: 0in; font-family: 宋体; color: black; font-size: 10.5pt">应</p></td>
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<p style="margin: 0in; font-family: 宋体; color: black; font-size: 10.5pt">不应</p></td></tr>
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<p style="margin: 0in; font-family: 宋体; color: black; font-size: 10.5pt">一个或极少不同值</p></td>
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<p style="margin: 0in; font-family: 宋体; color: black; font-size: 10.5pt">不应</p></td>
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<p style="margin: 0in; font-family: 宋体; color: black; font-size: 10.5pt">不应</p></td></tr>
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<p style="margin: 0in; font-family: 宋体; color: black; font-size: 10.5pt">小数目的不同值</p></td>
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<p style="margin: 0in; font-family: 宋体; color: black; font-size: 10.5pt">应</p></td>
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<p style="margin: 0in; font-family: 宋体; color: black; font-size: 10.5pt">不应</p></td></tr>
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<p style="margin: 0in; font-family: 宋体; color: black; font-size: 10.5pt">大数目的不同值</p></td>
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<p style="margin: 0in; font-family: 宋体; color: black; font-size: 10.5pt">不应</p></td>
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<p style="margin: 0in; font-family: 宋体; color: black; font-size: 10.5pt">应</p></td></tr>
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<p style="margin: 0in; font-family: 宋体; color: black; font-size: 10.5pt">频繁更新的列</p></td>
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<p style="margin: 0in; font-family: 宋体; color: black; font-size: 10.5pt">不应</p></td>
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<p style="margin: 0in; font-family: 宋体; color: black; font-size: 10.5pt">应</p></td></tr>
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<p style="margin: 0in; font-family: 宋体; color: black; font-size: 10.5pt">外键列</p></td>
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<p style="margin: 0in; font-family: 宋体; color: black; font-size: 10.5pt">应</p></td>
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<p style="margin: 0in; font-family: 宋体; color: black; font-size: 10.5pt">应</p></td></tr>
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<p style="margin: 0in; font-family: 宋体; color: black; font-size: 10.5pt">主键列</p></td>
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<p style="margin: 0in; font-family: 宋体; color: black; font-size: 10.5pt">应</p></td>
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<p style="margin: 0in; font-family: 宋体; color: black; font-size: 10.5pt">应</p></td></tr>
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<p style="margin: 0in; font-family: 宋体; color: black; font-size: 10.5pt">频繁修改索引列</p></td>
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<p style="margin: 0in; font-family: 宋体; color: black; font-size: 10.5pt">不应</p></td>
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<p style="margin: 0in; font-family: 宋体; color: black; font-size: 10.5pt">不应</p></td></tr></tbody></table></div>
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<p style="margin: 0in; font-family: Calibri; color: #595959; font-size: 9pt">Pasted from <<a href="http://blog.csdn.net/cqf7174/archive/2009/05/08/4159398.aspx">http://blog.csdn.net/cqf7174/archive/2009/05/08/4159398.aspx</a>> </p><img src="http://www.cnblogs.com/winksky/aggbug/1812289.html?type=1" width="1" height="1" alt=""/><p><a href="http://www.cnblogs.com/winksky/archive/2010/08/30/1812289.html" target="_blank">本文链接</a></p>http://www.cnblogs.com/winksky/archive/2007/04/17/716495.htmlThis is a test post by Windows Live Writer2007-04-17T03:47:00Z2007-04-17T03:47:00ZWinkSkyhttp://www.cnblogs.com/winksky/http://www.cnblogs.com/winksky/archive/2006/12/05/582743.html[提问]升级至SQL2005后续问题讨论.遇到2个比较困惑的问题，第一个是关于DTS资料源的问题：原DTS中有一个步骤为执行SQL工作(跑一个存储过程)，DB升级至SQL2005后出现溢位错误，无法跑这个步骤，但在SQL Query Analyzer中直接跑存储过程确实可以的，后把数据源从OLE DB改成ODBC后就好了，是不是OLE DB在SQL2005上的处理有所变更？第二个是关于Linked Server的问题：原本一个段类似于一下...2006-12-05T05:24:00Z2006-12-05T05:24:00ZWinkSkyhttp://www.cnblogs.com/winksky/http://www.cnblogs.com/winksky/archive/2006/11/24/570641.html[提问]SQL2005关于点对点事务型映射昨日在参加Microsoft SQL Server 2005 Upgrade Seminar 后有问到一个讲师一个问题，本来是想问是否可以用Database Mirroring技术实现让公司各厂区访问Local的Database以达到最大的效能，得到的结论是不行的，后来讲师有提到SQL2005里的一个新技术[点对点事务型映射]可以实现我所需要的功能，不过刚才查了一下发现几乎找不到相关的资料作参考，...2006-11-24T01:56:00Z2006-11-24T01:56:00ZWinkSkyhttp://www.cnblogs.com/winksky/http://www.cnblogs.com/winksky/archive/2006/10/27/541759.html李开复：21世纪7种人才最抢手 21世纪最需要哪些人才？昨（22）日，Google副总裁、Google大中华区总裁李开复博士作客电子科技大学，以《21世纪最需要的七种人才》为题给大学生们带来了一场充满睿智而又不失幽默的演讲。李开复说：“21世纪，我们最需要7种人才：创新实践者、跨领域工作者、三商兼高者、高效能沟通者、热爱工作者、积极主动者和乐观向上者。” 人才·创新实践者 在互联网时代，我们的任何一个好的商业想法或开拓市场的...2006-10-27T05:11:00Z2006-10-27T05:11:00ZWinkSkyhttp://www.cnblogs.com/winksky/http://www.cnblogs.com/winksky/archive/2006/09/21/510651.htmlSQL2000中奇怪的NULL值记录问题[求助]表资料：Table1:aabb1102203NULL4NULL通过查询分析器查询(不包含NULL记录) select*fromtable1wherebb<>'30'结果:aabb110220创建存储过程:CREATEPROCEDURE[dbo].[pGetTable1](@bbvarchar(10))ASSELECT*FROMTable1WHERE(bb<>@bb)GO通过...2006-09-21T04:57:00Z2006-09-21T04:57:00ZWinkSkyhttp://www.cnblogs.com/winksky/http://www.cnblogs.com/winksky/archive/2006/09/12/501922.htmlSQL2005常见性能问题排错演示代码[收藏]转载自SQL Server 2005 盛宴系列 - 陈亮
2006-09-12T05:05:00Z2006-09-12T05:05:00ZWinkSkyhttp://www.cnblogs.com/winksky/http://www.cnblogs.com/winksky/archive/2006/08/19/481297.html上海Oracle高峰会感悟 本周二(8/15)去茂名路上的花园饭店参加了"甲骨文公司企业级软件基础设施建设高峰会"，作为一名未接触过Oracle数据库的开发人员，此次去听的目的也只是想长长见识，了解一些好的想法与观点。原定从14点到17点结束的会后来到近18点才结束，5小时左右的演讲还是让我这个外行收获颇丰。一开场他们的业务经理就重复一句话"Oracle公司已经不只是一个软件公司了"，有点宣传目的......2006-08-19T07:40:00Z2006-08-19T07:40:00ZWinkSkyhttp://www.cnblogs.com/winksky/http://www.cnblogs.com/winksky/archive/2006/08/17/479800.htmlMicrosoft® Visual Studio® .NET™ 2003 Service Pack 1下载页面2006-08-17T12:01:00Z2006-08-17T12:01:00ZWinkSkyhttp://www.cnblogs.com/winksky/http://www.cnblogs.com/winksky/archive/2006/08/10/473651.html存储过程编写小工具[收藏]很早之前哪里搜的来的2个sp,之前一直丢在电脑某个角落了,今天在整理资料时无意中翻到,就把它贴到这上面来了分享一下,还是很不错的,尤其对于Table字段比较多的,可以减少不少时间呢^^2006-08-10T10:43:00Z2006-08-10T10:43:00ZWinkSkyhttp://www.cnblogs.com/winksky/