客户关系管理2011 EmailHashBase

Question

我刚刚从4.0升级到CRM 2011，我在应用程序日志中看到了很多错误，我想是由于电子邮件路由器的原因。错误文本是“查询执行时间30.0秒超过了10秒的阈值”。

下面是它正在执行的查询：

WITH Candidates
        (
            ActivityId
        ) AS
        (SELECT  ActivityId
        FROM     EmailHashBase WITH (NOLOCK)
        WHERE    ActivityId IN
                (SELECT  ActivityId
                FROM     EmailHashBase WITH (NOLOCK)
                WHERE    HashType = 0
                    AND Hash IN (111682,1892164739,45,1824023892,54,3805,125879)
                GROUP BY ActivityId
                HAVING   COUNT(ActivityId) >= 7
                )
            AND HashType = 1
            AND Hash IN (969105075,1418975348,547970098,1044570065,-1578559672,1137188287,-1492206818,1365121987,1893861533,-1313312639,-1829169632,-1685403462,-518982188,1123523219,284291011,-981044541,1790111815,-808308608,-599769785,971845046)
        GROUP BY ActivityId
        HAVING   COUNT(ActivityId) >= 2
        )
SELECT   TOP 1 a.ActivityId
FROM     ActivityPointerBase AS a WITH (NOLOCK)
WHERE    a.ActivityId IN
            (SELECT ActivityId
            FROM    Candidates AS c
            WHERE(
                    (SELECT COUNT(*)
                            FROM    EmailHashBase AS h
                            WHERE   h.ActivityId = c.ActivityId
                                AND h.HashType   = 0
                    )
                    <= 7
                ) 
            )
ORDER BY a.ModifiedOn DESC

直接对数据库运行此查询最多需要一分钟。我用"Set Statistics IO ON“运行了它，得到了以下结果：

Table 'Worktable'. Scan count 0, logical reads 0, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
Table 'EmailHashBase'. Scan count 17696074, logical reads 53155625, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
Table 'ActivityPointerBase'. Scan count 1, logical reads 5060, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.

SQL Server Execution Times:
CPU time = 36567 ms,  elapsed time = 36562 ms.

显然，EmailHashBase有一个问题。我已经在Hash列上添加了一个非聚集索引，并重新构建了索引，但是我仍然得到了很高的扫描和逻辑读取计数。

我无法更改查询。

关于我可以对表做些什么来修复这个问题，有什么建议吗？

Answer 1

原来是数据库调优顾问创建了一个索引，导致了延迟。删除索引已解决此问题。