SQL Using Cross Apply 使查询运行非常缓慢

Question

下面的查询需要 35 秒才能完成，所以前端应用程序抛出“超时过期”错误，我通过增加 CommandTimeOut 来修复，但我的审阅者不接受修复，因为修复必须在 sql 查询中完成。

下面是我的sql查询

select * from SamplesPartners as sp WITH (READUNCOMMITTED) WHERE (EXISTS
(
    SELECT      *
    FROM        SamplesPartners  AS sp2
    CROSS APPLY SE_GetCurrentParentContainersForItem(sp2.samplePartnerSqlId, sp2.samplePartnerIncId, 2, 293) AS CC
    JOIN        dbo.Containers   AS C ON    C.containerSqlId = CC.containerSqlId
                                        AND C.containerIncId = CC.containerIncId
                                        AND C.isDeleted      = 0x0
    LEFT JOIN   dbo.Shipments    AS S ON    S.containerSqlId = C.containerSqlId
                                        AND S.containerIncId = C.containerIncId
                                        AND S.isDeleted      = 0x0
    LEFT JOIN   dbo.Destinations AS D ON    D.containerSqlId = C.containerSqlId
                                        AND D.containerIncId = C.containerIncId
                                        AND D.isDeleted      = 0x0
    WHERE       sp2.samplePartnerSqlId = sp.samplePartnerSqlId
    AND         sp2.samplePartnerIncId = sp.samplePartnerIncId
    AND         (
                    C.containerCode   LIKE '%test%'
                OR  C.containerName   LIKE '%test%'
                OR  S.trackingNumber  LIKE '%test%'
                OR  D.destinationName LIKE '%test%'
                )   
    AND         sp2.isDeleted = 0x0
)) and isDeleted=0

下面是函数

ALTER FUNCTION [dbo].[SE_GetCurrentParentContainersForItem]
(
    @itemSqlId          SMALLINT,
    @itemIncId          INT,
    @itemMetaTableSqlId SMALLINT,
    @itemMetaTableIncId INT
)
RETURNS TABLE

AS

RETURN
WITH      ContainersMetaTable AS (
           -- Returns only 1 record.
           SELECT    metaTableSqlId,metaTableIncId FROM dbo.MetaTables WHERE metaTableName = 'Containers'),
          ContainerSubtree AS (
           -- Anchor member.
           SELECT    containerSqlId,containerIncId,0 AS lvl
           FROM      dbo.ContainersContents
           WHERE     contentSqlId          = @itemSqlId
             AND     contentIncId          = @itemIncId
             AND     contentMetaTableSqlId = @itemMetaTableSqlId
             AND     contentMetaTableIncId = @itemMetaTableIncId
             AND     isDeleted             = 0

           UNION ALL

           -- Recursive member.
           SELECT    cc.containerSqlId,
                     cc.containerIncId,
                     sub.lvl + 1        AS lvl
           FROM      ContainersMetaTable    AS cmt,
                     dbo.ContainersContents AS cc
           JOIN      ContainerSubtree       AS sub ON  cc.contentSqlId = sub.containerSqlId
                                                   AND cc.contentIncId = sub.containerIncId
                                                   AND cc.isDeleted    = 0
           WHERE     cc.contentMetaTableSqlId = cmt.metaTableSqlId
             AND     cc.contentMetaTableIncId = cmt.metaTableIncId             
          )
SELECT    containerSqlId,
          containerIncId,
          lvl
FROM      ContainerSubtree

我找不到可以改变和提高性能的地方。

Answer 1

我将您的查询更改为：

SELECT * 
FROM SamplesPartners AS sp WITH (READUNCOMMITTED) 
WHERE (EXISTS (
    SELECT      1
    FROM        SamplesPartners  AS sp2
    CROSS APPLY SE_GetCurrentParentContainersForItem(sp2.samplePartnerSqlId, sp2.samplePartnerIncId, 2, 293) AS CC
    JOIN        dbo.Containers   AS C ON    C.containerSqlId = CC.containerSqlId
                                        AND C.containerIncId = CC.containerIncId
                                        AND C.isDeleted      = 0
    LEFT JOIN   dbo.Shipments    AS S ON    S.containerSqlId = C.containerSqlId
                                        AND S.containerIncId = C.containerIncId
                                        AND S.isDeleted      = 0
    LEFT JOIN   dbo.Destinations AS D ON    D.containerSqlId = C.containerSqlId
                                        AND D.containerIncId = C.containerIncId
                                        AND D.isDeleted      = 0
    WHERE       sp2.samplePartnerSqlId = sp.samplePartnerSqlId
    AND         sp2.samplePartnerIncId = sp.samplePartnerIncId
    AND         (C.containerCode + ':' + C.containerName + ':' + S.trackingNumber + ':' + D.destinationName) LIKE '%test%'
    AND         sp2.isDeleted = 0
    )) 

我改变这个：

• 删除 OR 运算符并合并所有 LIKE 运算符以减少对数据的搜索。
• 使用1 作为一个字段而不是* 作为多个字段以减少内存使用。
• 我将isDeleted = 0x0 更改为isDeleted = 0 以减少它的类型转换，因为我认为它的类型不是varbinary，因为您也在表值函数中使用它。
• 我删除了最后一个 AND isDeleted = 0，因为您在 EXISTS 部分内检查它。