Question

我有2个数据库（v1，v7），它们具有相同的数据结构和架构。 v7上的数据大于v1。当我在v7上运行相同的SQL语句时需要不到1秒 v1也花了11s。

我的SQL声明：

SELECT 
    bs.[ID], bs.[TapeID], bs.[ChanelID], bs.[ContractID],
    bs.[ContractSectionID], bs.[Name], bs.[RegisterDate],
    bs.[ValidFrom], bs.[ValidToDate], bs.[GPRP], bs.[Status],
    bs.[Note], bs.[Code], bs.[JobCodeID], bs.[SpotCount],
    bs.[BookNumber], bs.[Adjusted], bs.[PrintedCNPS],
    bs.[UserID], bs.[CreateTime], bs.[ModifiedTime],
    '' + t.Code + ' - ' + t.Name, ch.Code, 
    '[' + c.Code + '] ' + cus.Name, cs.Code, 
    jb.Code, p.Name, us.UserName, cus.Code, t.Duration,
    (select count(*) from Spot 
     where Position in ('1','2','3','E','D','F') 
       and bs.ID = Spot.BookScheudlerID 
       and Status not in (2,3,5)) as SpotUuTien, --mục địch tạo ra column
    (select count(*) from Spot 
     where Position in ('A') and Pending = 1 
       and bs.ID = Spot.BookScheudlerID 
       and Status not in (2, 3, 5)) as SpotUuTienFree, /*mục địch tạo ra column*/ 
FROM 
    [BookScheduler] bs 
INNER JOIN
    Tape t on bs.TapeID = t.ID
INNER JOIN
    Contract c on bs.ContractID = c.ID
INNER JOIN
    ContractSection cs on bs.ContractSectionID = cs.ID
LEFT JOIN 
    JobCode jb on bs.JobCodeID = jb.ID
INNER JOIN
    Product p on t.ProductID = p.ID
INNER JOIN
    Chanel ch on bs.ChanelID = ch.ID
INNER JOIN
    Customer cus on c.CustomerID = cus.ID
LEFT JOIN 
    AppUser us on bs.UserID = us.ID 
WHERE 
    bs.ValidFrom >= '05/01/2015 00:00:00' 
    AND bs.ValidToDate <= '05/30/2015 00:00:00'

我认为v1上的问题索引应该重建其索引。然后运行上面的sql语句，但结果没有改变。

然后我创建了一个与v1结构相同的新数据库，并且我将数据从v1移动到新数据库，当我在新数据库上以非常快的速度运行SQL语句时（如在v7上）。

那么让我问一下我的v1是什么？以及如何在不创建新数据库的情况下提高速度？

SQL Server中的问题？

0 个答案: