[英]SQL Server 2008 equivalent for FETCH OFFSET with WHERE clause
我有一个程序,我的用户可以使用该程序查找过去7天内发生的所有数据流量。 我使用存储过程来获取数据 - 一次250条记录(用户可以翻阅该数据)。 问题是,当用户想要查看数据时,会有很多超时。
这是我尝试优化ist之前的存储过程。
@MaxRecCount INT,
@PageOffset INT,
@IncludeData BIT
SELECT [Client], [Schema], [Version], [Records], [Fetched], [Receipted], [ProvidedAt], [FetchedAt], [ReceiptedAt],[PacketIds], [Record] FROM (
SELECT TOP(@MaxRecCount) MAX(bai_ExportPendingArchive.[UserName]) AS Client,
MAX(bai_ExportPendingArchive.Category) AS [Schema],
MAX(bai_ExportPendingArchive.ContractVersion) AS [Version],
COUNT(*) AS [Records],
SUM (CASE WHEN bai_ExportPendingAckArchive.ExportPendingId IS NULL THEN 0 ELSE 1 END) as [Fetched],
SUM (CASE WHEN bai_ExportPendingAckArchive.Receipted IS NULL THEN 0 ELSE 1 END) as [Receipted],
MAX(bai_ExportArchive.Inserted) AS [ProvidedAt],
MAX(CASE WHEN bai_ExportPendingAckArchive.ExportPendingId IS NULL THEN NULL ELSE bai_ExportPendingAckArchive.Inserted END) AS [FetchedAt],
MAX(CASE WHEN bai_ExportPendingAckArchive.Receipted IS NULL THEN NULL ELSE bai_ExportPendingAckArchive.Receipted END) AS [ReceiptedAt],
bai_ExportArchive.PacketIds AS [PacketIds],
NULL AS [Record],
ROW_NUMBER() Over (Order By MAX(bai_ExportArchive.Inserted) desc) as [RowNumber]
FROM bai_ExportArchive
INNER JOIN bai_ExportPendingArchive ON bai_ExportArchive.Id = bai_ExportPendingArchive.ExportId
LEFT OUTER JOIN bai_ExportPendingAckArchive ON bai_ExportPendingAckArchive.ExportPendingId = bai_ExportPendingArchive.Id
GROUP BY bai_ExportPendingArchive.[UserName], bai_ExportArchive.PacketIds, bai_ExportPendingArchive.Category
) AS InnerTable WHERE RowNumber > (@PageOffset * @MaxRecCount) and RowNumber <= (@PageOffset * @MaxRecCount + @MaxRecCount)
ORDER BY RowNumber
@MaxRecCount,@ PageOffset和@IncludeData是来自我的C#-method的参数。 这个版本需要大约1:35分钟才能获得我想要的数据。 为了使存储过程更快,我插入一个WHERE子句以过滤Inserted col(我也在此列上创建了一个索引)并使用OFFSET FETCH:
优化后的存储过程:
@MaxRecCount INT,
@PageOffset INT,
@IncludeData BIT
Declare @pageStart int
Declare @pageEnd int
SET @pageStart = @PageOffset * @MaxRecCount
SET @pageEnd = @pageStart + @MaxRecCount + 50
IF @IncludeData = 0
BEGIN
SELECT [Client], [Schema], [Version], [Records], [Fetched], [Receipted], [ProvidedAt], [FetchedAt], [ReceiptedAt],[PacketIds], [Record] FROM (
SELECT TOP(@MaxRecCount) bai_ExportPendingArchive.[UserName] AS Client,
bai_ExportPendingArchive.Category AS [Schema],
MAX(bai_ExportPendingArchive.ContractVersion) AS [Version],
COUNT(*) AS [Records],
SUM (CASE WHEN bai_ExportPendingAckArchive.ExportPendingId IS NULL THEN 0 ELSE 1 END) as [Fetched],
SUM (CASE WHEN bai_ExportPendingAckArchive.Receipted IS NULL THEN 0 ELSE 1 END) as [Receipted],
MAX(bai_ExportArchive.Inserted) AS [ProvidedAt],
MAX(CASE WHEN bai_ExportPendingAckArchive.ExportPendingId IS NULL THEN NULL ELSE bai_ExportPendingAckArchive.Inserted END) AS [FetchedAt],
MAX(CASE WHEN bai_ExportPendingAckArchive.Receipted IS NULL THEN NULL ELSE bai_ExportPendingAckArchive.Receipted END) AS [ReceiptedAt],
bai_ExportArchive.PacketIds AS [PacketIds],
NULL AS [Record],
ROW_NUMBER() Over (Order By MAX(bai_ExportArchive.Inserted) desc) as [RowNumber]
FROM bai_ExportArchive
INNER JOIN bai_ExportPendingArchive ON bai_ExportArchive.Id = bai_ExportPendingArchive.ExportId
LEFT OUTER JOIN bai_ExportPendingAckArchive ON bai_ExportPendingAckArchive.ExportPendingId = bai_ExportPendingArchive.Id
Where bai_ExportArchive.Inserted <= (Select bai_ExportArchive.Inserted from bai_ExportArchive Order by bai_ExportArchive.Inserted DESC Offset @pageStart ROWS FETCH NEXT 1 ROWS Only)
And bai_ExportArchive.Inserted > (Select bai_ExportArchive.Inserted from bai_ExportArchive Order by bai_ExportArchive.Inserted DESC Offset @pageEnd ROWS FETCH NEXT 1 ROWS Only)
GROUP BY bai_ExportPendingArchive.[UserName], bai_ExportArchive.PacketIds, bai_ExportPendingArchive.Category
) AS InnerTable
ORDER BY RowNumber
这个版本给了我大约2s的数据。 唯一的问题是,我在Microsoft SQL Server 2014上工作,但我的用户使用SQL Server 2008+。 现在的问题是,OFFSET FETCH在Server 2008中不起作用。现在我无法理解如何优化我的存储过程,它很快就可以在SQl Server 2008上运行。
我很感谢任何帮助:)
尝试使用此方法来处理SQL Server 2005/2008
的分页。
首先使用CTE
为您的选择查询使用ROW_NUMBER()
列来标识记录号/计数。 之后,您可以使用PAGE_NUMBER
和PAGE_COUNT
从此CTE
选择一系列记录。 示例如下
DECLARE @P_PAGE_NUM INT = 0
,@P_PAGE_SIZE INT = 20
;WITH CTE
AS
( /*SELECT ROW_NUMBER() OVER (ORDER BY COL_to_SORT DESC) AS [ROW_NO]
,...
WHERE ....
*/ -- You can replace your select query here, but column [ROW_NO] should be there in your select list.
--ie ROW_NUMBER() OVER (ORDER BY put_column-to-sort-here DESC) AS [ROW_NO]
)
SELECT *
--,( SELECT COUNT(*) FROM CTE) AS [TOTAL_ROW_COUNT]
FROM CTE
WHERE (
ISNULL(@P_PAGE_NUM,0) = 0 OR
[ROW_NO] BETWEEN ( @P_PAGE_NUM - 1) * @P_PAGE_SIZE + 1
AND @P_PAGE_NUM * @P_PAGE_SIZE
)
ORDER BY [ROW_NO]
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