备份数据库sql语句（备份数据的sql语句）

工作中需要创建SQL Job对数据库进行定期备份，现把脚本记录如下。

1. 完整备份：

-- FULL
declare @filename    varchar(1024),
        @file_dev    varchar(300)

declare @path        varchar(1024)
set     @path = N'F:BackupPlan2';

declare @extension_name varchar(16)
set     @extension_name = N'bak';

set @filename = convert(varchar(1024), getdate(), 120)
set @filename = replace(@filename, ':', '')
set @filename = replace(@filename, '-', '')
set @filename = replace(@filename, ' ', '')

set @filename = @filename + '_' + convert (varchar(3), datepart(ms, getdate())) + N'.' + @extension_name

-- start backup, COMPRESSION is the parameter
set @file_dev = @path + 'SmartDev_Full_' + @filename
backup database [SmartDev] to disk = @file_dev 
with noformat, init,  name = N'SmartDev-Database full backup', COMPRESSION

-- delete the old backup file 1 days ago
declare @olddate datetime
select @olddate=getdate()-1

-- execute delete
select @path
select @extension_name
select @olddate
execute master.dbo.xp_delete_file 0, @path, @extension_name, @olddate, 1
go

2. 差异备份：

-- Differential
declare @filename    varchar(1024),
        @file_dev    varchar(300)

declare @path        varchar(1024)
set     @path = N'F:BackupPlan2';

declare @extension_name varchar(16)
set     @extension_name = N'bak';

set @filename = convert(varchar(1024), getdate(), 120)
set @filename = replace(@filename, ':', '')
set @filename = replace(@filename, '-', '')
set @filename = replace(@filename, ' ', '')

set @filename = @filename + '_' + convert (varchar(3), datepart(ms, getdate())) + N'.' + @extension_name

-- start backup, COMPRESSION is the parameter
set @file_dev = @path + 'SmartDev_Differential_' + @filename
backup database [SmartDev] to disk = @file_dev 
with differential, noformat, init,  name = N'SmartDev-Database Differential backup'

go

以上两段可以分别创建两个SQL Job，比如完整备份的作业可以定在每周天凌晨运行，执行成功后删掉之前的备份文件（代码中有删除的语句），差异备份的作业定在周一到周六每天凌晨运行。