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:Data2Primary
C:Data2FG1
C:Data2FG2
C:Data2FG3
C:Data2FG4
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:Data2PrimaryData Partition DB Primary FG.mdf',
SIZE=5,
MAXSIZE=500,
FILEGROWTH=1 ),
FILEGROUP [Data Partition DB FG1]
(NAME = 'Data Partition DB FG1',
FILENAME =
'C:Data2FG1Data Partition DB FG1.ndf',
SIZE = 5MB,
MAXSIZE=500,
FILEGROWTH=1 ),
FILEGROUP [Data Partition DB FG2]
(NAME = 'Data Partition DB FG2',
FILENAME =
'C:Data2FG2Data Partition DB FG2.ndf',
SIZE = 5MB,
MAXSIZE=500,
FILEGROWTH=1 ),
FILEGROUP [Data Partition DB FG3]
(NAME = 'Data Partition DB FG3',
FILENAME =
'C:Data2FG3Data Partition DB FG3.ndf',
SIZE = 5MB,
MAXSIZE=500,
FILEGROWTH=1 ),
FILEGROUP [Data Partition DB FG4]
(NAME = 'Data Partition DB FG4',
FILENAME =
'C:Data2FG4Data 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
http://www.cnblogs.com/jackyrong/archive/2006/11/13/559354.html