sql server 2005中的表分區

2024-08-31 01:05:32

字體：大中小

來源：轉載

供稿：網友

SQL SERVER 2005中，終于引入了表分區，就是說，當一個表里的數據很多時，可以將其分拆到
多個的表里，大大提高了性能。下面舉例子說明之

比如，在C盤下建立如下幾個目錄
C:Data2Primary
C:Data2FG1
C:Data2FG2
C:Data2FG3
C:Data2FG4

其中primary存放的是主數據庫文件，其他FG1--FG4存放四個單獨的文件組，可以見創立數據庫
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 )
接下來，我們創建分區表函數，這其實可以理解為一個規則，說明如何以一個規則來將一個表來劃分，如下 use [Data Partition DB2]
GO
CREATE PARTITION FUNCTION [Data Partition Range](int)
AS RANGE LEFT FOR VALUES (100,200,300)
其中分區函數的名稱是Data Partition Range,后面的類型（int)表明接下來用來分區的那個字段的類型是INT類型，
而VALUES (100,200,300)表明，將把表分為4個區了，是從負數到100，100-200，200-300，大于300。
接下來，我們要創建分區架構，即將分區函數應用到我們分好的四個文件組里面去
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]);

再創建表的結構USE [Data Partition DB2]
go
CREATE TABLE MyTable
(ID INT NOT NULL, Date DATETIME, Cost money)
   ON [Data Partition Scheme] (ID);

這里注意，ON [Data Partition Scheme] (ID);表明，劃分時以ID的大小作為劃分的根據，ON后要跟分區架購的名稱

最后，我們可以填充數據了

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