SQL定时备份并删除过期备份

a

--完整备份
Declare @FileName varchar(100)
Set @FileName='D:\数据备份\' + convert(varchar(10),getdate(),120)+ '.bak'
BackUp Database CoalTraffic To Disk=@FileName 
With Init

b

--差异备份（必须与完整备份同名）
Declare @FileName varchar(100)
Set @FileName='D:\数据备份\' + convert(varchar(10),getdate(),120)+ '.bak'
Backup database CoalTraffic To Disk=@FileName 
With Differential

c

--删除创建时间为@CreateDate，类型为BAK的文件

--与BAK的文件名没有关系
declare @CreateDate datetime
select @CreateDate=getdate()-1
EXECUTE master.dbo.xp_delete_file 0,N'D:\数据备份\',N'BAK',@CreateDate