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我刚刚从 4.0 升级到 CRM 2011，我在应用程序日志中看到很多错误，我认为是由于电子邮件路由器。错误文本是“30.0 秒的查询执行时间超过了 10 秒的阈值”。

这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。我使用“Set Statistics IO ON”运行它并得到以下结果：

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 有问题。我在 Hash 列上添加了一个非聚集索引并重建了索引，但我仍然得到很高的扫描和逻辑读取计数。

我无法更改查询。

关于我可以对桌子做些什么来解决这个问题有什么建议吗？

4

1 回答 1

0

结果发现导致延迟的数据库调整顾问创建了一个索引。删除索引已解决问题。

于 2012-10-30T19:43:38.210 回答