Question

我有一个SQL Server数据库，它在1个月，2个月之后每秒存储一行，而数据库很大，超过100万行。我想知道在数据库自动更新到新数据库后如何备份或删除旧行。

Answer 1

我使用了几年前为档案馆构建的一种“通用代码”，并且效果很好。我为您做了一些调整。假定您有一个名为DateRecord的字段，其中包含最后一次添加或修改记录的日期。另外，您具有ProdDB和ArchiveDB，并且ProdDB中的一个表与ArchiveDB中的表具有相同的结构，只是ArchiveDB中的ID不能为IDENTITY，而可以具有UNIQUE索引：

-- Deletes from the Archive if older than one year
 DELETE FROM ArchiveDB.dbo.YourTable
 WHERE DateDiff(d, DateRecord, GetDate()) > 365 

-- Insert into the ArchiveDB table if older than 30 days (set your request here)
 INSERT INTO ArchiveDB.dbo.YourTable
     SELECT * FROM ProdDB.dbo.YourTable SRC 
     WHERE DateRecord < DATEADD(d, -30, GETDATE())
       AND NOT EXISTS ( 
           SELECT 1 FROM ArchiveDB.dbo.YourTable DST 
           WHERE    SRC.[ID] = DST.[ID]     )

-- Delete from ProdDB if older than 30 days and has been moved to the ArchiveDB
 DELETE FROM ProdDB.dbo.YourTable 
 WHERE DateRecord < DATEADD(d, -30, GETDATE())
   AND EXISTS ( 
       SELECT 1 FROM ArchiveDB.dbo.YourTable DST 
       WHERE        [ID] = DST.[ID]     )

Answer 2

我正在查阅@Angel M.的代码，并且我得到了运行的结果。谢谢天使

BEGIN
 DECLARE @Ngayhientai Datetime = GETDATE();
 DECLARE @ngayquakhu Datetime;
 DECLARE @datrungay Datetime;
 DECLARE @Daylakieuso int;
 DECLARE @lastyear int;


  SELECT TOP(1) @ngayquakhu = daylabientable.DateTime
 FROM [DatabaseMobus].[dbo].TableModbus daylabientable;

 SELECT @Daylakieuso = DATEDIFF(d,@ngayquakhu,@Ngayhientai)
 FROM [DatabaseMobus].[dbo].[TableModbus];

 IF @Daylakieuso>1
 INSERT INTO [DatabaseMobus].[dbo].[SaoluuTable]([STT],[RegisterModbus],[DateTime])
 SELECT [STT],[RegisterModbus],[DateTime]
 FROM [DatabaseMobus].[dbo].[TableModbus] nguondulieu
  WHERE NOT EXISTS(SELECT 1 FROM [DatabaseMobus].[dbo].[SaoluuTable] laylinkgoc
  WHERE laylinkgoc.DateTime = nguondulieu.DateTime);

 SELECT TOP(1) @datrungay = honmotthang.DateTime
 FROM [DatabaseMobus].[dbo].[SaoluuTable] honmotthang;

 SELECT @lastyear = DATEDIFF(d,@datrungay,@Ngayhientai)
 FROM [DatabaseMobus].[dbo].[TableModbus];

 IF @lastyear=365
 INSERT INTO  [DatabaseMobus].[dbo].[Dulieuhon1nam]([STT],[RegisterModbus],[DateTime]) 
  SELECT [STT],[RegisterModbus],[DateTime]
  FROM [DatabaseMobus].[dbo].[SaoluuTable] thoidinhe
 WHERE NOT EXISTS(SELECT 1 FROM [DatabaseMobus].[dbo].[SaoluuTable] chisokhac
  WHERE chisokhac.DateTime = thoidinhe.DateTime);
 IF @lastyear>365
 DELETE FROM [DatabaseMobus].[dbo].[SaoluuTable];

END

存储新数据库后如何删除大数据库中的行（SQL Server）

2 个答案: