sql server 2005中的表分區(qū)

2024-08-31 00:51:15

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SQL SERVER 2005中，終于引入了表分區(qū)，就是說，當(dāng)一個表里的數(shù)據(jù)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:/Data2/PRimary
C:/Data2/FG1
C:/Data2/FG2
C:/Data2/FG3
C:/Data2/FG4

其中primary存放的是主數(shù)據(jù)庫文件，其他FG1--FG4存放四個單獨(dú)的文件組，可以見創(chuàng)立數(shù)據(jù)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:/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 )
接下來，我們創(chuàng)建分區(qū)表函數(shù)，這其實(shí)可以理解為一個規(guī)則，說明如何以一個規(guī)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(qū)函數(shù)的名稱是Data Partition Range,后面的類型（int)表明接下來用來分區(qū)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(qū)了，是從負(fù)數(shù)到100，100-200，200-300，大于300。
接下來，我們要創(chuàng)建分區(qū)架構(gòu)，即將分區(qū)函數(shù)應(yīng)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(chuàng)建表的結(jié)構(gòu)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(jù)，ON后要跟分區(qū)架購的名稱

最后，我們可以填充數(shù)據(jù)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