Question

我一直在编写一个流程来根据特定的业务规则评估计算机，以确定它们是否有资格在其上安装产品。我最初使用的是一个小型SQLite数据库，但该项目开始变得足够大，以至于我将其转换为MS SQL Server。数据库中有大约500k行。

在SQLite上花费大约30秒的查询在SQL服务器上花了将近30分钟。我希望它会快得多，因为我正在迁移到拥有更多系统资源的专用服务器。

查询如下。基本思想是我有一个包含计算机信息的表和一个包含规则的表，并且需要将不同的规则与计算机信息表中的不同列进行比较。我还需要考虑＆＃34;包含＆＃34; - 如果计算机具有包含规则，则优先于任何排除规则。

我对SQL来说相当新，所以它可能只是一个写得不好的查询，但它似乎提供了预期的结果。它的速度太慢了。

WITH RulesWith
AS (
    SELECT *
    FROM Rules
    WHERE
        productName = 'Dlp'
        AND (
            _dateEffective IS NULL
            OR _dateEffective <= '20160906'
            )
        AND (
            _dateExpired IS NULL
            OR _dateExpired >= '20160906'
            )
    )
SELECT C.*
FROM Computers AS C
WHERE (
        (
            C._dateEffective IS NULL
            OR C._dateEffective <= '20160906'
            )
        AND (
            C._dateExpired IS NULL
            OR C._dateExpired >= '20160906'
            )
        )
    AND (
        (
            C.site_name IN (
                SELECT value
                FROM RulesWith
                WHERE propertyName = 'Site'
                    AND typeName = 'Include'
                )
            OR C.computer_fqdn IN (
                SELECT value
                FROM RulesWith
                WHERE propertyName = 'Computer'
                    AND typeName = 'Include'
                )
            OR C.computer_ou IN (
                SELECT value
                FROM RulesWith
                WHERE propertyName = 'ComputerOU'
                    AND typeName = 'Include'
                )
            OR C.user_ou IN (
                SELECT value
                FROM RulesWith
                WHERE propertyName = 'UserOU'
                    AND typeName = 'Include'
                )
            )
        OR NOT (
            C.site_name IN (
                SELECT value
                FROM RulesWith
                WHERE propertyName = 'Site'
                    AND typeName = 'Exclude'
                )
            OR C.computer_fqdn IN (
                SELECT value
                FROM RulesWith
                WHERE productName = 'MyProduct'
                    AND propertyName = 'Computer'
                    AND typeName = 'Exclude'
                )
            OR C.computer_ou IN (
                SELECT value
                FROM RulesWith
                WHERE propertyName = 'ComputerOU'
                    AND typeName = 'Exclude'
                )
            OR C.user_ou IN (
                SELECT value
                FROM RulesWith
                WHERE propertyName = 'UserOU'
                    AND typeName = 'Exclude'
                )
            )
        )

编辑：删除大量UPPER（）函数可将查询时间大幅缩短至约5分钟。我仍然希望进一步清理它，但这是一个巨大的差异。

为什么SQL Server运行此查询需要比SQLite更长的时间？

0 个答案: