Question

我有一个存储过程，它将记录从详细信息表复制到历史记录表。它将在一天内运行一次。详细表中的记录量是几十万。将详细信息复制到历史记录表需要2个多小时。

如何改善表现？

我的程序：

set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
GO
ALTER procedure [dbo].[sp_Job_Archive_Record_Count]            
    @p_ToDate  DATETIME,          
    @p_Detail_Ins  INT OUTPUT,          
    @p_Detail_Del INT OUTPUT,          
    @p_Header_Ins INT OUTPUT,          
    @p_Header_Del INT OUTPUT          
as          
BEGIN TRAN    
    SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED          
    INSERT into tbl_Detail_History    
    SELECT * FROM tbl_Detail WITH(NOLOCK)    
    WHERE i_HeaderKey IN           
    (SELECT i_HeaderKey FROM tbl_Header WITH(NOLOCK)
    WHERE d_dateTime <= cast(@p_ToDate AS DATETIME)          
    )          

    SET @p_Detail_Ins = @@ROWCOUNT        
    INSERT INTO tbl_Archive_Count values('Detail',@p_Detail_Ins,getdate  (),@p_ToDate)          

    DELETE FROM tbl_detail           
    WHERE i_DetailKey IN          
        (SELECT i_DetailKey FROM tbl_Detail_History WITH(NOLOCK))          

    SET @p_Detail_Del = @@ROWCOUNT                   


    INSERT INTO tbl_Header_History    
    SELECT * FROM tbl_Header WITH(NOLOCK)    
        WHERE d_dateTime <= cast(@p_ToDate as DATETIME)          

    SET @p_Header_Ins = @@ROWCOUNT        
    INSERT INTO tbl_Archive_Count values('Header',@p_Header_Ins,getdate(),@p_ToDate)          

    DELETE FROM tbl_Header    
    WHERE i_Headerkey IN           
    (SELECT i_HeaderKey FROM tbl_Header_History WITH(NOLOCK))          

    SET @p_Header_Del = @@ROWCOUNT     

    IF (@@ERROR <> 0)    
        BEGIN    
            ROLLBACK TRAN       
        END    
COMMIT TRAN

Answer 1

取决于tbl_detail和tbl_detail_history之间的索引和行比率的变化

DELETE FROM tbl_detail           
WHERE i_DetailKey IN          
    (SELECT i_DetailKey FROM tbl_Detail_History WITH(NOLOCK))

到

DELETE FROM tbl_detail  D         
WHERE exists (select 1 from FROM tbl_Detail_History WITH(NOLOCK) where i_DetailKey = d.i_DetailKey)

可以使用tbl_header删除进行类似的更改。如果你获得性能提升，你会寻找我还建议删除无锁提示，特别是删除语句，因为你可能会导致自己在那里有完整性问题。看看可以有益的read_committed_snapshot

HTH

使用存储过程将记录从详细信息表移动到历史表

1 个答案: