一、引言
刪除分區又稱為合并分區，簡單地講就是將多個分區的數據進行合并。現以表Sales.SalesOrderHeader作為示例，演示如何進行表分區刪除。
重要的事情說三遍：備份數據庫！備份數據庫！備份數據庫！
二、演示
2.1、數據查詢
2.1.1、 查看分區元數據
SELECT * FROM SYS.PARTITION_FUNCTIONS --分區函數 SELECT * FROM SYS.PARTITION_RANGE_VALUES --分區方案
2.1.2、統計每個分區的數據量
SELECT $PARTITION.SalesOrderHeader_OrderDate(OrderDate) AS NUMBER,COUNT(1) AS COUNT FROM [Sales].[SalesOrderHeader] GROUP BY $PARTITION.SalesOrderHeader_OrderDate(OrderDate)
分區表中有數據時，是不能夠刪除分區方案和分區函數的，只能將數據先移到其它表中，再刪除。
2.2、刪除實操
2.2.1、合并原表分區
ALTER PARTITION FUNCTION SalesOrderHeader_OrderDate() MERGE RANGE("2011-01-01 00:00:00.000")
ALTER PARTITION FUNCTION SalesOrderHeader_OrderDate() MERGE RANGE("2012-01-01 00:00:00.000")
ALTER PARTITION FUNCTION SalesOrderHeader_OrderDate() MERGE RANGE("2013-01-01 00:00:00.000")
ALTER PARTITION FUNCTION SalesOrderHeader_OrderDate() MERGE RANGE("2014-01-01 00:00:00.000")
2.2.2、備份原表所有索引的創建腳本
ALTER TABLE [Sales].[SalesOrderHeader] ADD CONSTRAINT [PK_SalesOrderHeader_SalesOrderID] PRIMARY KEY NONCLUSTERED
(
[SalesOrderID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, IGNORE_DUP_KEY = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
2.2.3、刪除原表所有索引
ALTER TABLE [Sales].[SalesOrderHeader] DROP CONSTRAINT [PK_SalesOrderHeader_SalesOrderID]
2.2.4、創建臨時表
CREATE TABLE [Sales].[SalesOrderHeader_Temp](
[SalesOrderID] [INT] IDENTITY(1,1) NOT FOR REPLICATION NOT NULL,
[RevisionNumber] [TINYINT] NOT NULL,
[OrderDate] [DATETIME] NOT NULL,
[DueDate] [DATETIME] NOT NULL,
[ShipDate] [DATETIME] NULL,
[Status] [TINYINT] NOT NULL,
[OnlineOrderFlag] [dbo].[Flag] NOT NULL,
[SalesOrderNumber] AS (ISNULL(N"SO"+CONVERT([NVARCHAR](23),[SalesOrderID]),N"*** ERROR ***")),
[PurchaseOrderNumber] [dbo].[OrderNumber] NULL,
[AccountNumber] [dbo].[AccountNumber] NULL,
[CustomerID] [INT] NOT NULL,
[SalesPersonID] [INT] NULL,
[TerritoryID] [INT] NULL,
[BillToAddressID] [INT] NOT NULL,
[ShipToAddressID] [INT] NOT NULL,
[ShipMethodID] [INT] NOT NULL,
[CreditCardID] [INT] NULL,
[CreditCardApprovalCode] [VARCHAR](15) NULL,
[CurrencyRateID] [INT] NULL,
[SubTotal] [MONEY] NOT NULL,
[TaxAmt] [MONEY] NOT NULL,
[Freight] [MONEY] NOT NULL,
[TotalDue] AS (ISNULL(([SubTotal]+[TaxAmt])+[Freight],(0))),
[Comment] [NVARCHAR](128) NULL,
[rowguid] [UNIQUEIDENTIFIER] ROWGUIDCOL NOT NULL,
[ModifiedDate] [DATETIME] NOT NULL
)
2.2.5、更改原表數據空間類型
1）對著原表Sales.SalesOrderHeader點擊"右鍵"->"設計"。
2）點擊菜單欄"視圖"->"屬性窗口"。
3）將數據空間類型更改為"文件組"，常規數據空間規范默認為"PRIMARY"。
2.2.6、移動原表分區數據到臨時表
ALTER TABLE [Sales].[SalesOrderHeader] SWITCH PARTITION 1 TO [Sales].[SalesOrderHeader_Temp] PARTITION 1
2.2.7、創建原表所有索引到臨時表
ALTER TABLE [Sales].[SalesOrderHeader_Temp] ADD CONSTRAINT [PK_SalesOrderHeader_SalesOrderID] PRIMARY KEY NONCLUSTERED
(
[SalesOrderID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, IGNORE_DUP_KEY = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
2.2.8、刪除原表
DROP TABLE Sales.SalesOrderHeader
2.2.9、刪除分區方案和分區函數
DROP PARTITION SCHEME SalesOrderHeader_OrderDate DROP PARTITION FUNCTION SalesOrderHeader_OrderDate
2.2.10重命名表名
EXEC SP_RENAME "[Sales].[SalesOrderHeader_Temp]","SalesOrderHeader"
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原文鏈接：https://www.cnblogs.com/atomy/p/15348686.html
