分区表--SQLServer创建分区表

分区表的定义大体上分为三个步骤：
1)定义分区函数
2)定义分区构架
3)定义分区表

4)修改分区表...

************* 以下为测试代码 [b]*************[/b]

USE [master]
GO

CREATE DATABASE [Test] ON PRIMARY
( NAME = N'Test', FILENAME = N'D:\Program Files\Microsoft SQL Server\MSSQL10_50.MSSQLSERVER\MSSQL\DATA\Test.mdf' , SIZE = 3MB , MAXSIZE = UNLIMITED, FILEGROWTH = 2048KB ),
FILEGROUP [FG1]
( NAME = N'Test1', FILENAME = N'D:\Program Files\Microsoft SQL Server\MSSQL10_50.MSSQLSERVER\MSSQL\DATA\Test1.ndf' , SIZE = 3072KB , MAXSIZE = UNLIMITED, FILEGROWTH = 1024KB ),
FILEGROUP [FG2]
( NAME = N'Test2', FILENAME = N'D:\Program Files\Microsoft SQL Server\MSSQL10_50.MSSQLSERVER\MSSQL\DATA\Test2.ndf' , SIZE = 3072KB , MAXSIZE = UNLIMITED, FILEGROWTH = 1024KB ),
FILEGROUP [FG3]
( NAME = N'Test3', FILENAME = N'D:\Program Files\Microsoft SQL Server\MSSQL10_50.MSSQLSERVER\MSSQL\DATA\Test3.ndf' , SIZE = 3072KB , MAXSIZE = UNLIMITED, FILEGROWTH = 1024KB )
LOG ON
( NAME = N'Test_log', FILENAME = N'D:\Program Files\Microsoft SQL Server\MSSQL10_50.MSSQLSERVER\MSSQL\DATA\test_1.ldf' , SIZE = 1024KB , MAXSIZE = 2048MB , FILEGROWTH = 1024KB )
GO

USE [Test]
GO
--创建分区函数
CREATE PARTITION FUNCTION fnPartition(DATE)
AS RANGE RIGHT--LEFT是左边包含分割点，RIGHT是右边包含
FOR VALUES('2010-01-01','2012-01-01')

--查看分区函数是否创建成功
SELECT * FROM sys.partition_functions

USE [Test]
GO
--创建分区架构
CREATE PARTITION SCHEME SchemaForPartition
AS PARTITION fnPartition
TO ([primary], FG1, FG2)--因为有2个边界值，则有3个分区，需要指定3个文件组，也可以使用ALL指向一个文件组

--查看已创建的分区架构schema
SELECT * FROM sys.partition_schemes

--创建分区表
CREATE TABLE PartitionTable
(
id INT,
SalesDate DATE
) ON SchemaForPartition(SalesDate)--SalesDate为指定划分区列

--查看创建的分区表
SELECT * FROM SYS.partitions WHERE OBJECT_ID=OBJECT_ID('PartitionTable')

--插入测试记录
DECLARE @T DATE
SET @T = '2009-01-01'
WHILE @T < GETDATE()
BEGIN
INSERT INTO PartitionTable VALUES(123, @T)
SET @T = DATEADD(MM, 1, @T)
END
--查询表记录
SELECT * FROM PartitionTable

--查询分区
SELECT $PARTITION.fnPartition('2009-01-01') AS PartitionNum--2009-01-01这条记录所在的分区号
SELECT * FROM PartitionTable WHERE $PARTITION.fnPartition(SalesDate)=2--查询2号分区的所有记录

--查看每个分区的记录数
SELECT $partition.fnPartition(SalesDate) AS PartitionNum
, COUNT(*) AS NumRows
FROM PartitionTable
GROUP BY $partition.fnPartition(SalesDate)
ORDER BY $partition.fnPartition(SalesDate)

--提供分割点，合并分区
ALTER PARTITION FUNCTION fnPartition()
MERGE RANGE('2012-01-01')

--拆分分区，首先加入文件组
ALTER DATABASE [Test] ADD FILEGROUP [FG4]
GO
ALTER DATABASE [Test] ADD FILE ( NAME = N'FG4', FILENAME = N'D:\Program Files\Microsoft SQL Server\MSSQL10_50.MSSQLSERVER\MSSQL\DATA\FG4.ndf' , SIZE = 3072KB , FILEGROWTH = 1024KB ) TO FILEGROUP [FG4]
GO
--知道分割后多出来的分区应该存储在哪个文件组
ALTER PARTITION SCHEME SchemaForPartition NEXT USED 'FG4'
--添加分割点
ALTER PARTITION FUNCTION fnPartition()
SPLIT RANGE('2013-01-01')

--切换分区
--PartitionTable2没有分区，将数据全部插入PartitionTable的分区4中，表结构要一致
ALTER TABLE dbo.PartitionTable2
SWITCH TO dbo.PartitionTable PARTITION 4