SSAS 多维数据集内存爆炸与 10 维 MDX 查询答案

【问题标题】：SSAS Cube Memory Explodes with MDX query with 10 DimensionsSSAS 多维数据集内存爆炸与 10 维 MDX 查询
【发布时间】：2011-10-25 18:24:43
【问题描述】：

我们正在使用 mdx 查询来查询 SSAS 多维数据集，该查询在多达 9 个维度上执行得非常快速高效。一旦我们达到 10 个维度，cube 的内存使用就会严重失控并使用机器上的所有可用内存，直到它基本上使机器崩溃。谁能回答为什么 10 会与 9 完全不同？

with member measures.CatKey
    as
    [Question Answer Primary].[Q-A].currentmember.properties('key')
select {
        measures.CatKey,
        [Measures].[AverageValue],
        KPIValue('KPI Question Average Delta Wave Over Wave'),
        KPITrend('KPI Question Average Delta Wave Over Wave'),
        [Measures].[TopBoxPercent],
        KPIValue('KPI Top Box Delta Wave Over Wave'),
        KPITrend('KPI Top Box Delta Wave Over Wave'),
        [Measures].[MiddleBoxPercent],
        KPIValue('KPI Middle Box Delta Wave Over Wave'),
        KPITrend('KPI Middle Box Delta Wave Over Wave'),
        [Measures].[BottomBoxPercent],
        KPIValue('KPI Bottom Box Delta Wave Over Wave'),
        KPITrend('KPI Bottom Box Delta Wave Over Wave'),
        [Measures].[Primary Response Count]
    } on columns,

    [Question Answer Primary].[Q-A].[QUESTIONCATEGORY] * [Question Answer Primary].[QUESTIONKEY].[QUESTIONKEY]
    DIMENSION PROPERTIES MEMBER_VALUE on rows

from [SATPlus_Cube]

where CrossJoin({[Response Wave].[Wave].&[20110101]}, 
{
    [Question Answer Primary].[QUESTIONCATEGORY].&[AfricaSpecific], 
    [Question Answer Primary].[QUESTIONCATEGORY].&[ChinaSpecific], 
    [Question Answer Primary].[QUESTIONCATEGORY].&[Training], 
    [Question Answer Primary].[QUESTIONCATEGORY].&[SalesSupport], 
    [Question Answer Primary].[QUESTIONCATEGORY].&[Relationship], 
    [Question Answer Primary].[QUESTIONCATEGORY].&[ProductsAndPartsQuality], 
    [Question Answer Primary].[QUESTIONCATEGORY].&[ProductSupport], 
    [Question Answer Primary].[QUESTIONCATEGORY].&[PricingAndDiscounts],
    [Question Answer Primary].[QUESTIONCATEGORY].&[Overall],
    [Question Answer Primary].[QUESTIONCATEGORY].&[KeyMetrics],
    [Question Answer Primary].[QUESTIONCATEGORY].&[ITSystemsSupport],
    [Question Answer Primary].[QUESTIONCATEGORY].&[GovernmentNationalSales],
    [Question Answer Primary].[QUESTIONCATEGORY].&[FinancingAndCredit],
    [Question Answer Primary].[QUESTIONCATEGORY].&[FieldSupport], 
    [Question Answer Primary].[QUESTIONCATEGORY].&[DistributionSupport], 
    [Question Answer Primary].[QUESTIONCATEGORY].&[AdvertisingSupport]
}, 
NonEmpty (
        {[Sample].[SAMPLE KEY].[SAMPLE KEY]},
        ( 
            {[Hierarchy].[Node Value].&[1]}
            , [Measures].[Primary Response Count]
        )
    ))

【问题讨论】：

标签： ssas mdx olap dimensions cube

【解决方案1】：

您尝试过 subcube 语法吗？也许效果更好……

    Select 
    {...} On Columns,
    {...} On Rows
    from (Select {{[Response Wave].[Wave].&[20110101]}} On Columns
          From {
        [Question Answer Primary].[QUESTIONCATEGORY].&[AfricaSpecific], 
        [Question Answer Primary].[QUESTIONCATEGORY].&[ChinaSpecific], 
        ...
        [Question Answer Primary].[QUESTIONCATEGORY].&[DistributionSupport], 
        [Question Answer Primary].[QUESTIONCATEGORY].&[AdvertisingSupport]
    } On Columns FROM [SATPlus_Cube]))
    WHERE .....

【讨论】：

【解决方案2】：

也许你的维度中有太多的成员（#10）。

【讨论】：