索引視圖可用性

Question

我有一個索引視圖：

CREATE VIEW ptv.vw_mokiniai_2 
WITH SCHEMABINDING 
AS 
    SELECT 
    T1.year_name, 
    T2.person_id, 
    T2.year, 
    T2.person_position, 
    COUNT_BIG(*) AS [aggregated number] 
    FROM Table1 AS T1 
    INNER JOIN Table2 AS T2 
    ON T1.year = T2.year 
    GROUP BY T1.year_name, 
    T2.person_id, 
    T2.year, 
    T2.person_position 

以獨特的聚集索引的列上

T1.year_name, T2.person_id, T2.year, T2.person_position 

我需要的查詢優化器使用該索引視圖，在查詢

SELECT 
    T1.year_name, 
    COUNT_BIG(DISTINCT T3.person_id) AS [persons_per_year] 
FROM Table1 AS T1 
INNER JOIN (
      SELECT 
       T2.person_id, 
       T2.year, 
       T2.person_position 
      FROM Table2 AS T2 
      GROUP BY T2.person_id, T2.year, T2.person_position 
      ) AS T3 
    ON T1.year = T3.year 
GROUP BY T1.year_name 

查詢必須使用派生表，因爲COGNOS生成此查詢，我不想編輯多維l型號。有人有一個想法怎麼可能做到？也許唯一的方法來優化查詢是刪除派生表（意味着我必須編輯多維模型）？任何建議（查看編輯和最終查詢編輯），將不勝感激。

Answer 1

以下示例在我的測試中使用了索引視圖。如果這在您的環境中不起作用，那麼您發佈的代碼中可能沒有明顯區別。

CREATE TABLE dbo.Table1 
    (
     year varchar(10) 
    , year_name varchar(10) 
    ); 

CREATE TABLE dbo.Table2 
    (
     year varchar(10) 
    , person_id varchar(10) 
    , person_position varchar(10) 
    ); 
GO 

CREATE VIEW dbo.vw_mokiniai_2 
WITH SCHEMABINDING 
AS 
    SELECT T2.person_id 
      , T2.year 
      , T2.person_position 
      , COUNT_BIG(*) AS [aggregated number] 
    FROM dbo.Table2 AS T2 
    GROUP BY T2.person_id 
      , T2.year 
      , T2.person_position 
GO 
CREATE UNIQUE CLUSTERED INDEX cdx ON vw_mokiniai_2(year, person_id, person_position) 
GO 

SELECT 
    T1.year_name, 
    COUNT_BIG(DISTINCT T3.person_id) AS [persons_per_year] 
FROM Table1 AS T1 
INNER JOIN (
      SELECT 
       T2.person_id, 
       T2.year, 
       T2.person_position 
      FROM Table2 AS T2 
      GROUP BY T2.person_id, T2.year, T2.person_position 
      ) AS T3 
    ON T1.year = T3.year 
GROUP BY T1.year_name 
GO