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SQL Server 2008 几项新特性概述

Jun 07, 2016 pm 03:04 PM
server sql new features Overview characteristic

本文介绍了 SQL Server 2008 数据集成功能,改进了分析服务,报告服务,以及Office集成方面的新 特性 …… 计划于2008年第一季度发布的SQL Server 2008不仅对原有性能进行了改进,还添加了许多新 特性 ,比如新添了数据集成功能,改进了分析服务,报告服务,

  本文介绍了SQL Server 2008数据集成功能,改进了分析服务,报告服务,以及Office集成方面的新特性……

  计划于2008年第一季度发布的SQL Server 2008不仅对原有性能进行了改进,还添加了许多新特性,比如新添了数据集成功能,改进了分析服务,报告服务,以及Office集成等等。

  SQL Server集成服务

  SSIS(SQL Server集成服务)是一个嵌入式应用程序,用于开发和执行ETL(解压缩、转换和加载)包。SSIS代替了SQL 2000的DTS。整合服务功能既包含了实现简单的导入导出包所必需的Wizard导向插件、工具以及任务,也有非常复杂的数据清理功能。SQL Server 2008 SSIS的功能有很大的改进和增强,比如它的执行程序能够更好地并行执行。在SSIS 2005,数据管道不能跨越两个处理器。而SSIS 2008能够在多处理器机器上跨越两个处理器 。而且它在处理大件包上面的性能得到了提高。SSIS引擎更加稳定,锁死率更低。

  Lookup功能也得到了改进。Lookup是SSIS一个常用的获取相关信息的功能。比如从CustomerID查找Customer Name,获取数据集。Lookup在SSIS中很常见,而且可以处理上百万行的数据集,因此性能可能很差。SQL 2008对Lookup的性能作出很大的改进,而且能够处理不同的数据源,包括 ADO.NET,XML,OLEDB和其他SSIS压缩包。

  SQL 2008可以执行TSQL的MERGE命令。用MERGE命令,只需一个语句就可以对行进行 UPDATE、INSERT或 DELETE。下面的例子就是如何用MERGE命令来把新的Inventory Item descriptions 列表插入已有的Inventory Master中。除了 descriptions, NewInventory表格中还加入了其他一些部分。如果没有MERGE语句,就需要执行两个命令才能完成。第一个命令查找匹配的Description然后更新。第二个命令查找不匹配项然后插入。有了MERGE,一个语句就可以完成这两个任务。步骤如下:

以下是引用片段:
  MERGE InventoryMaster AS im
  USING (SELECT InventoryID, Descr FROM NewInventory) AS src
  ON im. InventoryID = src. InventoryID
  WHEN MATCHED THEN
  UPDATE SET im.Descr = src.Descr
  WHEN NOT MATCHED THEN
  INSERT (InventoryID, Descr) VALUES (src. InventoryID, src.Descr);

  分析服务

  SSAS(SQL Server分析服务)也得到了很大的改进和增强。IB堆叠做出了改进,性能得到很大提高,而硬件商品能够为Scale out管理工具所使用。Block Computation也增强了立体分析的性能。

  报表服务

  SSRS(SQL Server 报表服务)的处理能力和性能得到改进,使得大型报表不再耗费所有可用内存。另外,在报表的设计和完成之间有了更好的一致性。 SQL SSRS 2008还包含了跨越表格和矩阵的TABLIX。 Application Embedding 允许用户点击报表中的 URL链接调用应用程序。

  Microsoft Office 2007

  SQL Server 2008能够与 Microsoft Office 2007完美地结合。例如,SQL Server Reporting Server能够直接把报表导出成为Word文档。而且使用 Report Authoring工具,Word和Excel都可以作为SSRS报表的模板。Excel SSAS新添了一个数据挖掘插件,提高了其性能。

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