《Microsoft SQL Server 2008 Analysis Services Step by Step》学习笔记十五：设计聚合（Aggregatio
SQL Server 2008中SQL应用系列及BI笔记系列--目录索引导读:本文继续介绍Analysis Services中设计聚合（Aggregations）。
本文将包括以下内容：
■1、使用Aggregation设计向导设计Aggregation
■2、通过创建属性关联和用户自定义层次来改善Aggregation
■3、使用AggregationUsage特性控制一个属性的聚合
■4、设计一个独立的Aggregation
■5、通过长期的数据量的估算改善Aggregation（Improve aggregation design by using long-term estimates of data volume）
■6、启用Analysis Services查询日志
■7、基于使用Usage-Based的优化向导的日志查询设计Aggregation
本文末尾提供两个项目源码：AdventureWorks_BI_Begin13和AdventureWorks_BI_End13，顾名思义，开始和完成。另外，包括数据库文件SSAS2008SBS_Data，请读者自行修改数据源ds的连接串。
4、不使用聚合向导设计聚合
下面我们不使用聚合设计向导设计聚合。
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改变Partition Counts
http://l3grwg.bay.livefilestore.com/y1pl-4otQM9moREtLQx5yA7MgURR6izbOd9bTDBiXZEOMixrjVqR94sQkJhS6G5BnfVVtLk0moaNobsxG1Mcwxa_4uKPUq3O37i/2011-6-5%208-48-43.png?psid=1
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部署项目。
5－7、使用Usage-Based优化向导
除了使用聚合向导，还可以使用基于Usage-Based优化向导来设计聚合（http://64.4.11.252/zh-cn/library/ms189706(SQL.90).aspx），区别在于：
Usage-Based的优化向导用于为分区设计聚合，设计聚合时所基于的是 Analysis Services 实例查询日志中所记录的特定使用模式的查询。
聚合向导则考虑所有可能的查询。
我们启用查询日志
http://l3grwg.bay.livefilestore.com/y1pEhmUAHtGQ-WqbCVHoJRXJRMOBFqu9LCFVXluMN7mZU7kZum6Fn1GGMpEp8ib1_K3m5e2yfrH0P4KIJYlnWW_bjIV6IFcv5JJ/2011-6-5%2010-39-40.png?psid=1
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重新切换到vs项目，
http://l3grwg.bay.livefilestore.com/y1pfIubL_1xUGhQiroqCO16h3aIpbzHFQQrc9rRJnbWSlY7PUdpgmbr51MAqVzoCwHCQfjOg1RB0vbNwDtbE1wGwWfmlQCISLo_/2011-6-5%2010-52-27.png?psid=1
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OLAPQueryLOG数据表的字段如下：
MSOLAP_Database： Name of the Analysis Services database
MSOLAP_ObjectPath： Fully qualifed name of the object that was queried in the format ServerName DatabaseName CubeName PartitionName
MSOLAP_User： Name of the user who executed the query
Dataset： A string of zeros and ones indicating the level of each attribute hierarchy used to provide the query resultsDon’t worry about trying
to interpret this string; the Usage-Based Optimization Wizard will interpret the string and display the names of the attribute hierarchies returned by a query
StartTime： Time the query began in Coordinated Universal Time (UTC)
Duration： Length of time, in milliseconds, that it took to execute the query
下面我们使用日志进行Usage-Based的优化聚合设计
http://l3grwg.bay.livefilestore.com/y1psss-_spVxP1PXR-MDEA5_6MKCgocNZFlQ-408qCp675ZrTW-SEea3GyTBepKCEnel3tvWdF9CgJ_MBJO2De7WhJSlrI27BON/2011-6-5%2011-04-37.png?psid=1
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源码下载：
begin13
end13
数据库下载
参考资源：
1、SQL Server Analysis Services 官方教程
（http://technet.microsoft.com/zh-cn/library/ms170208.aspx）
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