如何利用大量聚合优化查询

Question

如何优化此查询？现在，它的运行速度太慢了~10秒。以下详细信息：

SELECT ProjectName, 
       Actuals_YTD, 
       Rem_Forecast, 
       Total_Forecast, 
       Approved_Budget, 
       Variance, 
       Variance_Percentage, 
       ProjectComments, 
       VersionType, 
       ModifiedDate 
FROM (SELECT pd.ProjectId, 
             pd.ProjectName, 
             SUM(CASE WHEN RPD.PROJECTMONTH_TO_DATE(base.ProjectMonth) <= '06/01/2011' THEN feb.USDactualamount ELSE 0.0 END) AS Actuals_YTD, 
             SUM(CASE WHEN RPD.PROJECTMONTH_TO_DATE(base.ProjectMonth) > '06/01/2011' THEN feb.forecastusd ELSE 0.0 END) AS Rem_Forecast, 
             ((SUM(CASE WHEN RPD.PROJECTMONTH_TO_DATE(base.ProjectMonth) <= '06/01/2011' THEN feb.USDactualamount ELSE 0.0 END)) + (SUM(CASE WHEN RPD.PROJECTMONTH_TO_DATE(base.ProjectMonth) > '06/01/2011' then feb.forecastusd else 0.0 end))) AS Total_Forecast, 
             SUM(COALESCE((feb.REVISEDPLANUSD),0)) AS Approved_Budget, 
             ((SUM(CASE WHEN RPD.PROJECTMONTH_TO_DATE(base.ProjectMonth) <= '06/01/2011' THEN feb.USDactualamount ELSE 0.0 END)) + (SUM(CASE WHEN RPD.PROJECTMONTH_TO_DATE(base.ProjectMonth) > '06/01/2011' then feb.forecastusd else 0.0 end))) - ((SUM(COALESCE((feb.REVISEDPLANUSD),0)))) AS Variance, 
             CASE WHEN (SUM(COALESCE((feb.REVISEDPLANUSD),0))) = 0 THEN NULL ELSE ((((((SUM(CASE WHEN RPD.PROJECTMONTH_TO_DATE(base.ProjectMonth) <= '06/01/2011' THEN feb.USDactualamount else 0.0 end)) + (SUM(CASE WHEN RPD.PROJECTMONTH_TO_DATE(projectmonth) > '06/01/2011' then feb.forecastusd else 0.0 end)))) - (SUM(COALESCE((feb.REVISEDPLANUSD),0)))) / (SUM(COALESCE((feb.REVISEDPLANUSD),0)))) * 100) END AS Variance_Percentage, 
             pd.ProjectAux1, 
             pd.ProjectComments, 
             pd.VersionType, 
             MAX(base.ModifiedDate) AS ModifiedDate 
      FROM rpd.ProjectDetail pd  INNER JOIN rpd.FundSource fs ON pd.FundSourceId = fs.FundSourceId  
                                 INNER JOIN rpd.Baseline base ON pd.ProjectId = base.ProjectId  
                                 INNER JOIN rpd.FundEntityBaseline feb ON feb.BaselineId = base.BaselineId  
      GROUP BY pd.ProjectAux1, pd.ProjectId, pd.ProjectName, pd.ProjectComments, pd.VersionType)
WHERE VersionType Like '%Text%' WITH UR

这里有3个表格的模式（不包括FundSource，因为它只有~200行，我认为它可以忽略不计）

架构：

行：

• FundEntityBaseline：354603
• 基线：80208
• ProjectDetail：1813

ProjectDetail指数：

• 1主键索引（ProjectId）
• 1外键索引（FundSourceId）
• 1包含SELECT / GROUP BY列的索引（ProjectAux1， ProjectId，ProjectName，ProjectComments，VersionType）
• 1个带有（VersionType，ProjectName）的索引

基线指数：

• 1主键索引（BaselineId）
• 1外键索引（ProjectId）
• 1个带有（ProjectTeamId，ProjectMonth）的索引
• 仅限ProjectMonth的1个索引

FundEntityBaseline上的指数

• 1主键索引（FundEntityBaselineId）
• 1外键索引（BaselineId）

最新的访问计划：

Answer 1

将where子句（WHERE VersionType，类似'％Text％）移到行上，这样它就会在内部SQL语句中。现在的方式是，您的查询将首先进行所有可能的连接，然后使用where子句过滤该完整集。

所以你的陈述就像

WHERE pd.VersionType Like '%Text%'
GROUP BY .....

Answer 2

在页面大小为32K的表空间中放置（=重新创建）索引 - 如果尚未配置的话。