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<head><title>SQL Server</title></head>
<center><h1>SQL Server</h1></center>
<div><P align=right><FONT face=Verdana><FONT color=#f70938><FONT face=黑体><a href="200604112229525.html" tppabs="http://www.itisedu.com/phrase/200604112229525.html" target="_new">中科永联</a>高级技术培训中心(</FONT><FONT face=黑体>www.itisedu.com</FONT><FONT face=黑体>)<IMG src="20064493354831.jpg" tppabs="http://www.itisedu.com/manage/Upload/image/20064493354831.jpg" border=0></FONT></FONT></FONT></P><FONT face=Verdana>
<P> <a href="200604040933575.html" tppabs="http://www.itisedu.com/phrase/200604040933575.html" target="_new">SQL Server</a>是微软公司开发的一个关系<a href="200603011033425.html" tppabs="http://www.itisedu.com/phrase/200603011033425.html" target="_new">数据库管理系统</a>,以Transact_<a href="javascript:if(confirm('http://www.itisedu.com/phrase/200604022014515.html \n\nThis file was not retrieved by Teleport Pro, because it was unavailable, or its retrieval was aborted, or the project was stopped too soon. \n\nDo you want to open it from the server?'))window.location='http://www.itisedu.com/phrase/200604022014515.html'" tppabs="http://www.itisedu.com/phrase/200604022014515.html" target="_new">SQL</a>作为它的<a href="200602271218062.html" tppabs="http://www.itisedu.com/phrase/200602271218062.html" target="_new">数据库</a>查询和编程语言。<a href="javascript:if(confirm('http://www.itisedu.com/phrase/200604022118155.html \n\nThis file was not retrieved by Teleport Pro, because it was unavailable, or its retrieval was aborted, or the project was stopped too soon. \n\nDo you want to open it from the server?'))window.location='http://www.itisedu.com/phrase/200604022118155.html'" tppabs="http://www.itisedu.com/phrase/200604022118155.html" target="_new">T-SQL</a>是结构化查询语言SQL的一种,支持ANSI SQL-92标准。</P>
<P> SQL Server 采用二级安全验证、登录验证及数据库用户帐号和角色的许可验证。SQL Server 支持两种身份验证<a href="200603061709535.html" tppabs="http://www.itisedu.com/phrase/200603061709535.html" target="_new">模式</a>:Windows NT身份验证和SQL Server 身份验证。7.0版支持多种<a href="200603051002565.html" tppabs="http://www.itisedu.com/phrase/200603051002565.html" target="_new">类型</a>的角色,"角色"概念的引入方便了权限的管理,也使权限的分配更加灵活。</P>
<P> SQL Server为公共的管理功能提供了预定义的服务器和数据库角色,可以很容易为某一特定用户授予一组选择好的许可权限。 SQL Server可以在不同的操作平台上运行,支持多种不同<a href="200603090857555.html" tppabs="http://www.itisedu.com/phrase/200603090857555.html" target="_new">类</a>型的网络协议如TCP/IP、IPX/SPX、Apple Talk等。SQL Server在服务器端的<a href="200604232134205.html" tppabs="http://www.itisedu.com/phrase/200604232134205.html" target="_new">软件</a>运行平台是Windows NT、Windows9x,在<a href="javascript:if(confirm('http://www.itisedu.com/phrase/200603082208195.html \n\nThis file was not retrieved by Teleport Pro, because it was unavailable, or its retrieval was aborted, or the project was stopped too soon. \n\nDo you want to open it from the server?'))window.location='http://www.itisedu.com/phrase/200603082208195.html'" tppabs="http://www.itisedu.com/phrase/200603082208195.html" target="_new">客户端</a>可以是Windows3.x、Windows NT、Windows9x,也可以采用其它厂商开发的系统如Unix、Apple Macintosh等。</P>
<P> 微软的SQL Server是一项完美的客户/服务器系统。SQL Server需要安装在Windows NT的平台上,而Windows NT可以支持Intel 386,Power PC,MIPS,Alpha PC和RISC等平台,它使SQL Server具备足够的威力和功能。</P>
<P> 这里所有的文章所采用的数据库应用<a href="200604232224305.html" tppabs="http://www.itisedu.com/phrase/200604232224305.html" target="_new">程序</a>都是基于SQL Server之上的,采用<a href="javascript:if(confirm('http://www.itisedu.com/phrase/200604151956245.html \n\nThis file was not retrieved by Teleport Pro, because it was unavailable, or its retrieval was aborted, or the project was stopped too soon. \n\nDo you want to open it from the server?'))window.location='http://www.itisedu.com/phrase/200604151956245.html'" tppabs="http://www.itisedu.com/phrase/200604151956245.html" target="_new">ODBC</a>及标准的SQL查询,可以非常简单的移植到任何一个支持ODBC的数据库之上,如:<a href="200604040935115.html" tppabs="http://www.itisedu.com/phrase/200604040935115.html" target="_new">Oracle</a>,Informix,<a href="javascript:if(confirm('http://www.itisedu.com/phrase/200604022243315.html \n\nThis file was not retrieved by Teleport Pro, because it was unavailable, or its retrieval was aborted, or the project was stopped too soon. \n\nDo you want to open it from the server?'))window.location='http://www.itisedu.com/phrase/200604022243315.html'" tppabs="http://www.itisedu.com/phrase/200604022243315.html" target="_new">Db2</a>和Access,在阅读有关ASP数据库编程技术之前,要确认你至少熟悉一种数据库管理系统,并可以使用标准的SQL查询语言操作数据库。</P>
<P> SQL Server提供服务器端的软件,这部分需要安装在NT Server上,SQL Server的<a href="javascript:if(confirm('http://www.itisedu.com/phrase/200604231337235.html \n\nThis file was not retrieved by Teleport Pro, because it was unavailable, or its retrieval was aborted, or the project was stopped too soon. \n\nDo you want to open it from the server?'))window.location='http://www.itisedu.com/phrase/200604231337235.html'" tppabs="http://www.itisedu.com/phrase/200604231337235.html" target="_new">用户端</a>则可以安装在许多用户端PC系统中,Windows可以让用户端进行数据库的建立,维护及存取等操作,SQL Server可以最多定义32767个数据库,每个数据库中,可以定义20亿个表格,每个表格可以有250个字段,每个表格的数据个数并没有限制,每一个表格可以定义250个索引,其中有一个可以是Clustered索引。</P>
<P> SQL Server所使用的数据库查询语言称为Transact-SQL,它是SQL Server的核心,Transact-SQL强化了原有的SQL关键字以进行数据的存取,储存及处理等功能,Transact-SQL扩充了流程控制指定,可以使你方便的编写功能强大的存储过程,他们存放在服务器端,并预先编译过,执行速度非常块,触发是一种特殊的存储过程,用来确保SQL Server数据库引用的完整性,你可以建立插入,删除和更新触发以控制相关的表格中对数据列的插入,删除和更新,你还可以使用规则(Rule),缺省(default)以及限制(Constraints),来协助将新的数值套用到表格中去!<BR> <BR><STRONG>一、SQL SERVER的特点</STRONG></P>
<P> 上手容易</P>
<P> 话分两头,如果您的企业至今还未购置数据库,其中一个主要的原因可能就是认为它不好上手,那么,从SQLServer开始吧。毕竟,大多数的中小企业日常的数据应用是建立在Windows平台上的。由于SQLServer与Windows界面风格完全一致,且有许多"向导(Wizard)"帮助,因此易于安装和学习,有关SQLServer的资料、培训随处可得,并且目前国内具有<a href="javascript:if(confirm('http://www.itisedu.com/phrase/200604022211495.html \n\nThis file was not retrieved by Teleport Pro, because it was unavailable, or its retrieval was aborted, or the project was stopped too soon. \n\nDo you want to open it from the server?'))window.location='http://www.itisedu.com/phrase/200604022211495.html'" tppabs="http://www.itisedu.com/phrase/200604022211495.html" target="_new">MCDBA</a>认证的工程师不在少数。</P>
<P> 从另一个角度来讲,学习SQLServer是掌握其他平台及大型数据,如Oracle,<a href="200604040934365.html" tppabs="http://www.itisedu.com/phrase/200604040934365.html" target="_new">Sybase</a>,<a href="javascript:if(confirm('http://www.itisedu.com/phrase/200604231245475.html \n\nThis file was not retrieved by Teleport Pro, because it was unavailable, or its retrieval was aborted, or the project was stopped too soon. \n\nDo you want to open it from the server?'))window.location='http://www.itisedu.com/phrase/200604231245475.html'" tppabs="http://www.itisedu.com/phrase/200604231245475.html" target="_new">DB</a>/2的基础。因为这些大型数据库对于设备、平台、人员知识的要求往往较高,而并不是每个人都具备这样的条件,且有机会去接触它们。但有了SQLServer的基础,再去学习和使用它们就容易多了。IT行业的实践经验充分证明了这一点。</P>
<P> 兼容性良好</P>
<P> 由于今天Windows<a href="200602281634075.html" tppabs="http://www.itisedu.com/phrase/200602281634075.html" target="_new">操作系统</a>占领着主导地的位,选择SQLServer一定会在兼容性方面取得一些优势。另外,SQLServer2000除了具有扩展性,可靠性以外,还具有可以迅速开发新的因特网系统的功能。尤其是它可以直接存贮<a href="200604231236585.html" tppabs="http://www.itisedu.com/phrase/200604231236585.html" target="_new">XML</a>数据,可以将搜索结果以XML格式输出等特点,有利于构建了异构系统的互操作性,奠定了面向互联网的企业应用和服务的基石。这些特点在.NET战略中发挥着重要的作用。</P>
<P> <a href="200603011335015.html" tppabs="http://www.itisedu.com/phrase/200603011335015.html" target="_new">电子商务</a></P>
<P> 在使用由MicrosoftSQLServer2000关系数据库引擎的情况下,XML数据可在关系表中进行存储,而查询则能以XML格式将有关结果返回。此外,XML支持还简化了后端系统集成,并实现了跨防火墙的无缝数据传输。你还可以使用HypertextTransferProtocol(超文本传输协议,HTTP)来访问SQLServer2000,以实现面向SQLServer2000数据库的安全Web连接和无须额外编程的<a href="javascript:if(confirm('http://www.itisedu.com/phrase/200603132213275.html \n\nThis file was not retrieved by Teleport Pro, because it was unavailable, or its retrieval was aborted, or the project was stopped too soon. \n\nDo you want to open it from the server?'))window.location='http://www.itisedu.com/phrase/200603132213275.html'" tppabs="http://www.itisedu.com/phrase/200603132213275.html" target="_new">联机分析处理</a>(<a href="javascript:if(confirm('http://www.itisedu.com/phrase/200604232107315.html \n\nThis file was not retrieved by Teleport Pro, because it was unavailable, or its retrieval was aborted, or the project was stopped too soon. \n\nDo you want to open it from the server?'))window.location='http://www.itisedu.com/phrase/200604232107315.html'" tppabs="http://www.itisedu.com/phrase/200604232107315.html" target="_new">OLAP</a>)多维数据集。</P>
<P> <a href="javascript:if(confirm('http://www.itisedu.com/phrase/200603091358275.html \n\nThis file was not retrieved by Teleport Pro, because it was unavailable, or its retrieval was aborted, or the project was stopped too soon. \n\nDo you want to open it from the server?'))window.location='http://www.itisedu.com/phrase/200603091358275.html'" tppabs="http://www.itisedu.com/phrase/200603091358275.html" target="_new">数据仓库</a></P>
<P> MicrosoftSQLServer2000非常明显的改进就是增加了OLAP(联机分析处理)功能,这可以让很多中小企业用户也可以使用数据仓库的一些特性进行分析。OLAP可以通过多维存储技术对大型、复杂数据集执行快速、高级的分析工作。<a href="javascript:if(confirm('http://www.itisedu.com/phrase/200603011738105.html \n\nThis file was not retrieved by Teleport Pro, because it was unavailable, or its retrieval was aborted, or the project was stopped too soon. \n\nDo you want to open it from the server?'))window.location='http://www.itisedu.com/phrase/200603011738105.html'" tppabs="http://www.itisedu.com/phrase/200603011738105.html" target="_new">数据挖掘</a>功能能够揭示出隐藏在大量数据中的倾向及趋势,它允许组织或机构最大<BR>限度的从数据中获取价值。通过对现有数据进行有效分析,这一功能可以对未来的趋势进行预测。</P>
<P> 增强的在线商务</P>
<P> MicrosoftSQLServer2000简化了管理、优化工作,并且增强了迅速、成功的部署在线商务应用程序所需的可靠性和伸缩性。其中,用以提高可靠性的特性包括日志传送、在线备份和故障切换群集。在伸缩性方面的改进包括对多达32颗CPU和64GBRAM的支持。通过自动优化和改进后的管理特性--诸如数据<a href="200602282323195.html" tppabs="http://www.itisedu.com/phrase/200602282323195.html" target="_new">文件</a>尺寸的自动管理、基于向导的数据库拷贝、自动内存管理和简化的故障切换群集安装与管理,在线商务应用程序能够被迅速部署并有效管理。</P>
<P> 利于构筑"敏捷性商务"</P>
<P> 所谓"敏捷性商务"就是能够打破内部和外部的商业界限,对迅速改变的环境做出快速反应。。微软已经与关键的合作伙伴建立起了战略关系,创造出了能够与许多供应商的产品实现整合的解决方案,因而企业用户并不需要做出"要么完全接受,要么全部不要"的承诺。在部署解决方案的过程中,企业用户不一定要拆除原有的设备从头。敏捷商务让企业用户能够充分利用现有的系统,自主决定所需的硬件和软件解决方案以及由谁来提供,伸缩自如、游刃有余。</P>
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