sql server 2005中的表分區

2024-08-31 00:43:34

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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:/Data2/Primary

C:/Data2/FG1

C:/Data2/FG2

C:/Data2/FG3

C:/Data2/FG4

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]

/****** 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]

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]

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