SQL server 2005的表分区

下面来说下，在SQL SERVER 2005的表分区里，如何对已经存在的有数据的表进行分区，其实道理和之前在http://www.cnblogs.com/jackyrong/archive/2006/11/13/559354.html说到一样，只不过交换下顺序而已，下面依然用例子说明：
   依然在c盘的data2目录下建立4个文件夹，用来做4个文件组，然后建立数据库

use master
IF  EXISTS (SELECT name FROM sys.databases WHERE name = N'Data Partition DB3')
DROP DATABASE [Data Partition DB3]
GO
CREATE DATABASE [Data Partition DB3]
ON PRIMARY
(NAME='Data Partition DB Primary FG3',
FILENAME=
'C:\Data2\Primary\Data Partition DB Primary FG3.mdf',
SIZE=5,
MAXSIZE=500,
FILEGROWTH=1 ),
FILEGROUP [Data Partition DB3 FG1]
(NAME = 'Data Partition DB3 FG1',
FILENAME =
'C:\Data2\FG1\Data Partition DB3 FG1.ndf',
SIZE = 5MB,
MAXSIZE=500,
FILEGROWTH=1 ),
FILEGROUP [Data Partition DB3 FG2]
(NAME = 'Data Partition DB3 FG2',
FILENAME =
'C:\Data2\FG2\Data Partition DB3 FG2.ndf',
SIZE = 5MB,
MAXSIZE=500,
FILEGROWTH=1 ),
FILEGROUP [Data Partition DB3 FG3]
(NAME = 'Data Partition DB3 FG3',
FILENAME =
'C:\Data2\FG3\Data Partition DB3 FG3.ndf',
SIZE = 5MB,
MAXSIZE=500,
FILEGROWTH=1 ),
FILEGROUP [Data Partition DB3 FG4]
(NAME = 'Data Partition DB3 FG4',
FILENAME =
'C:\Data2\FG4\Data Partition DB3 FG4.ndf',
SIZE = 5MB,
MAXSIZE=500,
FILEGROWTH=1 )
然后建立一个数据表：

USE [Data Partition DB3]
go
CREATE TABLE MyTable
(ID INT NOT NULL,
Date DATETIME,
Cost money ) on [primary]
并建立一个索引

USE [Data Partition DB3]
go
CREATE UNIQUE CLUSTERED INDEX MyTable_IXC
ON MyTable(ID) on [PRIMARY]
接下来往表里增加数据

USE [Data Partition DB3]
go
declare @count int
set @count =-25
while @count <=100
begin
insert into MyTable select @count,getdate(),100.00
set @count=@count+1
end
set @count =101
while @count <=200
begin
insert into MyTable select @count,getdate(),200.00
set @count=@count+1
end
set @count =201
while @count <=300
begin
insert into MyTable select @count,getdate(),300.00
set @count=@count+1
end
set @count =301
while @count <=400
begin
insert into MyTable select @count,getdate(),400.00
set @count=@count+1
end
set @count =401
while @count <=800
begin
insert into MyTable select @count,getdate(),500.00
set @count=@count+1
end
此时查询一下，可以看到数据都在一个表里

select * from sys.partitions where object_name(object_id)='MyTable'
 
 我们再建立表分区函数

use [Data Partition DB3]
GO
CREATE PARTITION FUNCTION [Data Partition Range](int)
AS RANGE LEFT FOR VALUES (100,200,300)
这里表明分区的原则是四个分区，从负数到100，101-200，201-300，大于300
当然，如果用right for values的话，就是从负数到99，100到199，200-299，和大于300
 
最后，把表分区函数应用到文件组里

USE [Data Partition DB3]
go
CREATE PARTITION SCHEME [Data Partition Scheme]
AS PARTITION [Data Partition Range]
TO ([Data Partition DB3 FG1], [Data Partition DB3 FG2], [Data Partition DB3 FG3],[Data Partition DB3 FG4]);
把原来建立好的表，移动到这个表分区里
Drop index MyTable_IXC on MyTable with (Move To [Data Partition Scheme] (ID) )
 
最后看一看

select * from sys.partitions where object_name(object_id)='MyTable'
 
可以看到，原来的表的数据被正确分拆到四个文件组里去了，实现了表分区



SQL SERVER 2005中，终于引入了表分区，就是说，当一个表里的数据很多时，可以将其分拆到

多个的表里，大大提高了性能。下面举例子说明之



比如，在C盘下建立如下几个目录

C:\Data2\Primary

C:\Data2\FG1

C:\Data2\FG2

C:\Data2\FG3

C:\Data2\FG4



其中primary存放的是主数据库文件，其他FG1--FG4存放四个单独的文件组，可以见创立数据库

Data Partition DB2，如下

USE [master]
GO
/****** Object:  Database [Data Partition DB]    Script Date: 10/08/2006 23:09:53 ******/
IF  EXISTS (SELECT name FROM sys.databases WHERE name = N'Data Partition DB2')
DROP DATABASE [Data Partition DB2]
GO
CREATE DATABASE [Data Partition DB2]
ON PRIMARY
(NAME='Data Partition DB Primary FG',
FILENAME=
'C:\Data2\Primary\Data Partition DB Primary FG.mdf',
SIZE=5,
MAXSIZE=500,
FILEGROWTH=1 ),
FILEGROUP [Data Partition DB FG1]
(NAME = 'Data Partition DB FG1',
FILENAME =
'C:\Data2\FG1\Data Partition DB FG1.ndf',
SIZE = 5MB,
MAXSIZE=500,
FILEGROWTH=1 ),
FILEGROUP [Data Partition DB FG2]
(NAME = 'Data Partition DB FG2',
FILENAME =
'C:\Data2\FG2\Data Partition DB FG2.ndf',
SIZE = 5MB,
MAXSIZE=500,
FILEGROWTH=1 ),
FILEGROUP [Data Partition DB FG3]
(NAME = 'Data Partition DB FG3',
FILENAME =
'C:\Data2\FG3\Data Partition DB FG3.ndf',
SIZE = 5MB,
MAXSIZE=500,
FILEGROWTH=1 ),
FILEGROUP [Data Partition DB FG4]
(NAME = 'Data Partition DB FG4',
FILENAME =
'C:\Data2\FG4\Data Partition DB FG4.ndf',
SIZE = 5MB,
MAXSIZE=500,
FILEGROWTH=1 )
接下来，我们创建分区表函数，这其实可以理解为一个规则，说明如何以一个规则来将一个表来划分，如下

use [Data Partition DB2]
GO
CREATE PARTITION FUNCTION [Data Partition Range](int)
AS RANGE LEFT FOR VALUES (100,200,300)
其中分区函数的名称是Data Partition Range,后面的类型（int)表明接下来用来分区的那个字段的类型是INT类型，
而VALUES (100,200,300)表明，将把表分为4个区了，是从负数到100，100-200，200-300，大于300。
接下来，我们要创建分区架构，即将分区函数应用到我们分好的四个文件组里面去
USE [Data Partition DB2]
go
CREATE PARTITION SCHEME [Data Partition Scheme]
AS PARTITION [Data Partition Range]
TO ([Data Partition DB FG1], [Data Partition DB FG2], [Data Partition DB FG3],[Data Partition DB FG4]);
 
再创建表的结构

USE [Data Partition DB2]
go

CREATE TABLE MyTable

(ID INT NOT NULL, Date DATETIME, Cost money)    

   ON [Data Partition Scheme] (ID);



这里注意，ON [Data Partition Scheme] (ID);表明，划分时以ID的大小作为划分的根据，ON后要跟分区架购的名称
最后，我们可以填充数据了


USE [Data Partition DB2]
go
declare @count int
set @count =-25
while @count <=100
begin
insert into MyTable select @count,getdate(),100.00
set @count=@count+1
end
set @count =101
while @count <=200
begin
insert into MyTable select @count,getdate(),200.00
set @count=@count+1
end
set @count =201
while @count <=300
begin
insert into MyTable select @count,getdate(),300.00
set @count=@count+1
end
set @count =301
while @count <=400
begin
insert into MyTable select @count,getdate(),400.00
set @count=@count+1
end
set @count =401
while @count <=800
begin
insert into MyTable select @count,getdate(),500.00
set @count=@count+1
end



最后，我们可以查询下，插入的这些数据，是否真的被划分到四个不同的文件组里的表分区了，可以这样看

SELECT *, $PARTITION.[Data Partition Range](ID)

 FROM MyTable