数据库文件过大时就要进行数据分区，就是讲数据库拆分到多个文件组中。已方便数据文件管理，提高数据库的读取效能，多文件组如何进行数据库的备份和还原呢，今天主要做多文件组数据库的备份和还原实验。

第一步

创建数据库qhw_test 数据库包括一个userinfo 数据表，userinfo数据表根据id做分区 包括一个主分区

，五个次分区，主分区包括qhw_test,data2两个文件，

数据表脚本如下

CREATE TABLE [dbo].[userinfo](
    [Id] [int] IDENTITY(1,1) NOT NULL,
    [UserName] [varchar](50) NOT NULL,
    [CreateTime] [datetime] NOT NULL,
 CONSTRAINT [PK_userinfo] PRIMARY KEY CLUSTERED
(
    [Id] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF,

ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON)
)

GO

SET ANSI_PADDING OFF
GO

ALTER TABLE [dbo].[userinfo] ADD  CONSTRAINT [DF_userinfo_UserName]  DEFAULT ('') FOR

[UserName]
GO

ALTER TABLE [dbo].[userinfo] ADD  CONSTRAINT [DF_userinfo_CreateTime]  DEFAULT (getdate())

FOR [CreateTime]
GO

往数据表中写入数据

第二部

然后执行数据库备份

使用完整备份模式一次备份数据库文件，先备份主分区，一次备份其他次分区，最后做事务日志备份

备份完成后，将备份文件转移至另一台机器

第三部

进行还原操作，先还原主分区，依次还原次分区，还原事务日志，注意NORECOVERY,

RESTORE DATABASE  qhw_test FILEGROUP = 'PRIMARY'  FROM DISK = 'D:\bak\bak\qhw_test1.bak'

WITH FILE = 1,
move 'qhw_test' to 'd:\bak\qhw_test.mdf',
move 'data2' to 'd:\bak\data2.ndf',
move 'qhw_test_log' to 'd:\bak\qhw_test_log.ldf'
,
NORECOVERY,REPLACE,STATS = 10

RESTORE DATABASE  qhw_test FILEGROUP = 'g1'  FROM DISK = 'D:\bak\bak\g1.bak' WITH FILE = 1,
move 'g1' to 'd:\bak\g1.ndf',

NORECOVERY,REPLACE,STATS = 10

RESTORE DATABASE  qhw_test FILEGROUP = 'g2'  FROM DISK = 'D:\bak\bak\g2.bak' WITH FILE = 1,
move 'g2' to 'd:\bak\g2.ndf',

NORECOVERY,REPLACE,STATS = 10

RESTORE DATABASE  qhw_test FILEGROUP = 'g3'  FROM DISK = 'D:\bak\bak\g3.bak' WITH FILE = 1,
move 'g3' to 'd:\bak\g3.ndf',

NORECOVERY,REPLACE,STATS = 10

RESTORE DATABASE  qhw_test FILEGROUP = 'g4'  FROM DISK = 'D:\bak\bak\g4.bak' WITH FILE = 1,
move 'g4' to 'd:\bak\g4.ndf',
NORECOVERY,REPLACE,STATS = 10

RESTORE DATABASE  qhw_test FILEGROUP = 'g5'  FROM DISK = 'D:\bak\bak\g5.bak' WITH FILE = 1,
move 'g5' to 'd:\bak\g5.ndf',
NORECOVERY,REPLACE,STATS = 10

RESTORE LOG  qhw_test
FROM DISK =  'D:\bak\bak\log.bak'
WITH NORECOVERY
GO

RESTORE DATABASE  qhw_test
WITH RECOVERY

RESTORE DATABASE [' + @DataBaseName + ']
WITH RECOVERY