表分区的建立简历建立参考
http://www.databasejournal.com/features/mssql/article.php/3640891
1,创建分区
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创建分区
USE [master]
GO
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/**//****** 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 )
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2,创建分区函数
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分区函数
use [Data Partition DB2]
GO
CREATE PARTITION FUNCTION [Data Partition Range](int)
AS RANGE LEFT FOR VALUES (100,200,300)
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3,创建分区架构
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创建分区架构
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]);
4,创建表
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创建表
USE [Data Partition DB2]
go
CREATE TABLE MyTable
(ID INT NOT NULL,
Date DATETIME,
Cost money)
ON [Data Partition Scheme] (ID);
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5,创建聚合索引
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创建聚合索引
USE [Data Partition DB2]
go
CREATE UNIQUE CLUSTERED INDEX MyTable_IXC
ON MyTable(ID)
ON [Data Partition Scheme] (ID)
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分区函数共有三个分临界值:100,200,300,有四个文件组[Data Partition DB FG1]到[... FG4],存储规则如下:
分区号 |
范围 |
文件组名 |
1 |
x<=100 |
[Data Partition DB FG1] |
2 |
100<x<=200 |
[Data Partition DB FG2] |
3 |
200<x<=300 |
[Data Partition DB FG3] |
4 |
300<x |
[Data Partition DB FG4] |
现在要求加入500这个临界值,并加入文件组[Data Partition DB FG5],如下操作:
1,建立文件组:
ALTER DATABASE [Data Partition DB2]ADD FILEGROUP [Data Partition DB FG5]
ALTER DATABASE [Data Partition DB2]ADD FILE(NAME='Data Partition DB FG5',
FILENAME='D:\Database\Data Partition DB FG5.ndf') TO FILEGROUP [Data Partition DB FG5];
2,更改分区架构
ALTER PARTITION SCHEME [Data Partition Scheme]
NEXT USED [Data Partition DB FG5];
3,更改分区函数
ALTER PARTITION FUNCTION [Data Partition Range](int)
SPLIT RANGE (500)
然后我们来看有什么变化:
分区架构:
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 FG5],
[Data Partition DB FG4])
分区函数:
USE [Data Partition DB2]
GO
CREATE PARTITION FUNCTION [Data Partition Range](int) AS RANGE LEFT FOR VALUES (100, 200, 300, 500)
这时的存储规则:
分区号 |
范围 |
文件组名 |
1 |
x<=100 |
[Data Partition DB FG1] |
2 |
100<x<=200 |
[Data Partition DB FG2] |
3 |
200<x<=300 |
[Data Partition DB FG3] |
4 |
300<x<=500 |
[Data Partition DB FG5] |
5 |
500<x |
[Data Partition DB FG4] |
可以看到新加的文件组并没有排到最后一们,而FG4成为新的临界点。那我们加入新的临界点400呢,
变化如下
分区架构:
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 FG5],
[Data Partition DB FG6],
[Data Partition DB FG4])
分区函数:
USE [Data Partition DB2]
GO
CREATE PARTITION FUNCTION [Data Partition Range](int) AS RANGE LEFT FOR VALUES (100, 200, 300,400, 500)
存储规则将变为
分区号 |
范围 |
文件组名 |
1 |
x<=100 |
[Data Partition DB FG1] |
2 |
100<x<=200 |
[Data Partition DB FG2] |
3 |
200<x<=300 |
[Data Partition DB FG3] |
4 |
300<x<=400 |
[Data Partition DB FG5] |
5 |
400<x<=500 |
[Data Partition DB FG6] |
6 |
500<x |
[Data Partition DB FG4] |
所以对于具体时间维的数据仓库来说,时间做为临界点,是不断增加的,我们一开始创建事实表分区时,最后一个分区应该叫做类似[Data Partiotion DB FG LAST]的名称,
最后,有一个问题还没有实践,对于一个有1000w条记录的文件组,用一个文件保存和用十个文件保存,查询效率会有什么样的不同呢?