在SQL Server 2012中使用带有Fulltext的OFFSET/FETCH时性能下降

Question

我正在尝试编写一个数据库大小的查询结果分页.正如SQL Server 2012所提供的OFFSET/FETCH,我正在使用它.但是在我将语句添加到查询后,需要花费10倍的时间.

查询:

SELECT 
    p.ShopId, 
    count(1) as ProductsQuantity, 
    MIN(LastPrice) as MinPrice, 
    MAX(LastPrice) as MaxPrice
FROM Product2 p WITH (NOLOCK)
INNER JOIN
   CONTAINSTABLE(Product2, ProductName, 'czarny') AS KEY_TBL
ON KEY_TBL.[key]=p.Id
WHERE 
    (p.LastStatus > 0 OR p.LastStatus = -1) 
GROUP BY p.ShopId
ORDER BY p.ShopId asc



SELECT 
    p.ShopId, 
    count(1) as ProductsQuantity, 
    MIN(LastPrice) as MinPrice, 
    MAX(LastPrice) as MaxPrice
FROM Product2 p WITH (NOLOCK)
INNER JOIN
   CONTAINSTABLE(Product2, ProductName, 'czarny') AS KEY_TBL
ON KEY_TBL.[key]=p.Id
WHERE 
    (p.LastStatus > 0 OR p.LastStatus = -1)   
GROUP BY p.ShopId
ORDER BY p.ShopId asc
OFFSET  10 ROWS
FETCH NEXT 10 ROWS ONLY

第一个查询在3秒内返回结果,第二个查询在47秒内返回.执行计划是不同的,第二个的成本仅评估为7%,对我来说完全没有意义:

我需要帮助如何提高分页的性能.

Answer 1

如果没有掌握架构和数据，就很难提出建议。在这 3 秒内，您至少应该能够做一件事。第一次查询需要 47 秒。第二个，将第一个查询的结果放入临时表中，然后将其用于order by ... offset fetch next：

create table #tmp (Id int not NULL, Quantity int, MinPrice decimal(10,4), MaxPrice decimal(10,4), primary key clustered (Id))

insert into #tmp
SELECT 
    p.ShopId, 
    count(1) as ProductsQuantity, 
    MIN(LastPrice) as MinPrice, 
    MAX(LastPrice) as MaxPrice
FROM Product2 p WITH (NOLOCK)
INNER JOIN
   CONTAINSTABLE(Product2, ProductName, 'czarny') AS KEY_TBL
ON KEY_TBL.[key]=p.Id
WHERE 
    (p.LastStatus > 0 OR p.LastStatus = -1) 
GROUP BY p.ShopId

select ShopId, ProductsQuantity, MinPrice, MaxPrice
from #tmp
ORDER BY ShopId asc
OFFSET  10 ROWS
FETCH NEXT 10 ROWS ONLY