sql server 2005中的表分区

王朝mssql·作者佚名  2008-05-30
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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

http://www.cnblogs.com/jackyrong/archive/2006/11/13/559354.html

 
 
 
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