消除 sql 索引假脱机时间

Question

我查看了 sql 查询的执行计划，该查询有 3 个索引假脱机任务，消耗了 69% (22% + 35% + 12%) 的时间。我的问题是....

是否可以在我请求之前进行索引假脱机处理？
由于类似的index spool可能很快又要做一遍，请问有什么办法可以保留结果来消除重复计算？

代码如下

SELECT IIF (TargetTime.MinTime <= CLTime.MinTime , [Target] ,[CL])  
FROM [defaultDB].[dbo].[Table1] AS M
JOIN(VALUES(0.003), (0.0035), (0.004), (0.0045), (0.005), (0.0055), (0.006), (0.0065), (0.007), (0.0075), (0.008)) AS T([target])
    ON 1 = 1
JOIN(VALUES(-0.003), (-0.0035), (-0.004), (-0.0045), (-0.005), (-0.0055), (-0.006), (-0.0065), (-0.007), (-0.0075), (-0.008), (-0.0085), (-0.009), (-0.0095), (-0.01), (-0.0105), (-0.011), (-0.0115)) AS C([CL])
    ON 1 = 1
OUTER APPLY
            (
             SELECT MIN([time]) AS MinTime
             FROM [defaultDB].[dbo].[Table2]
             WHERE [date] = M.[DATE]
                   AND [Start] >= M.Stime
                   AND [Time] <= M.etime
                   AND [H] > T.target
            ) as TargetTime
OUTER APPLY
            (
             SELECT MIN([time]) AS MinTime
             FROM [defaultDB].[dbo].[Table2]
             WHERE [date] = M.[DATE]
                   AND [Start] >= M.Stime
                   AND [Time] <= M.etime
                   AND L < C.CL
            ) as CLTime
WHERE [M].[date] IN(20120307, 20120601, 20121109, 20130826, 20131002, 20140117, 20140122, 20140311, 20140529, 20140718, 20150619, 20151014, 20151022, 20160411, 20160516, 20160721, 20160818, 20160909, 20170127, 20170213, 20170921, 20171025, 20171229, 20180116, 20180315, 20180926, 20181022, 20181128, 20181211, 20190104, 20190329, 20190502, 20190521, 20190528, 20190611, 20190627, 20190823, 20190930, 20191104, 20191211, 20200214, 20200318, 20200529, 20200706, 20200828, 20201230, 20210112, 20210305, 20210318, 20210408, 20210525, 20210617, 20210625)
  AND [Stime] >= 133000;

Answer 1

通过添加索引，我将查询速度从 1:27 提高到 0:12.

消除 sql 索引假脱机时间

eliminate sql index spool time

sql

indexing

performance

spool