IT博客-You and me... -文章分类-MSSQL思考

MS SQL 自动删除旧的数据库备份文件

疯狂水车 — Mon, 28 Jun 2010 03:44:00 GMT

MS SQL 自动删除旧的数据库备份文件，你可以把下面这段代码放进sql的DTS里面的vbs控件，然后用jobs控制什么时候运行，也可以另保存为vbs文件。然后用windows的Scheduled Tasks 来运行。

iDaysOld = 7
strPath = "D:\DatabaseBackup"

Set objFSO = CreateObject("Scripting.FileSystemObject")
Set objFolder = objFSO.GetFolder(strPath)
Set colSubfolders = objFolder.Subfolders
Set colFiles = objFolder.Files

For Each objFile in colFiles
   If objFile.DateLastModified < (Date() - iDaysOld) Then
       MsgBox "Dir: " & objFolder.Name & vbCrLf & "File: " & objFile.Name
       'objFile.Delete
   End If
Next

For Each objSubfolder in colSubfolders
   Set colFiles = objSubfolder.Files
   For Each objFile in colFiles
       If objFile.DateLastModified < (Date() - iDaysOld) Then
           MsgBox "Dir: " & objSubfolder.Name & vbCrLf & "File: " & objFile.Name
           'objFile.Delete
       End If
   Next
Next

把strPath＝"D:\DatabaseBackup"改成你备份的数据库文件。
如果你要真正运行就把MsgBox关掉，把objFile.Delete开启。

疯狂水车 2010-06-28 11:44 发表评论

SHRINK DATABASE LOG FILE

疯狂水车 — Sun, 27 Jul 2008 14:40:00 GMT

SHRINK DATABASE LOG FILE

Declare @dbhname nvarchar(255)
Set @dbname = "yourdbname"
Backup log @dbname with truncate_only
DBCC SHRINKDATABASE (@dbname,0)

疯狂水车 2008-07-27 22:40 发表评论

删除Table中重复的记录 (Delete data for duplicate)

疯狂水车 — Mon, 16 Jun 2008 11:08:00 GMT

状况是:除了主键不一样外,其余全一样.而不想把数据导出,删掉重复的记录,再重新导入
今天在工作中突然遇到这个问题,记得一二年前也有遇到这种问题,后来解决了.
现在却一时记不起当时的方法.没办法了自己再想吧.最后我用起了这种方法,也算是挺简单的.
不记得当时是不是也是用这种方法了.把SQL Query放在这边方便大家,如果你需要.

Select 0 as id,country,name,tel,address
Into #TMP
From Table
Where country='china'
Group by country,name,tel,address
Having count(*)>1

Update #TMP set #TMP.id = Table.id
From #TMP
Inner join Table on Table.country = #TMP.country
and Table.name = #TMP.name
and Table.tel = #TMP.tel
and (Table.address = #TMP.address or Table.address is null)

Select * from #TMP

Delete From Table Where id in (Select id From #TMP)

Drop Table #TMP

简单吧..如果你想说只删掉前面的或只删除后面的,那么加入排序.
值得注意的是字段如果是NULL的话,要像我一样加入 "or Table.address is null".不然不会匹配.

当然如果你想更小心一点的话,就先检后删.GOOD LUCK!

疯狂水车 2008-06-16 19:08 发表评论