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SQL Server表分區(qū)刪除詳情

 更新時間：2021年10月15日 16:54:33   作者：縹緲的塵埃  
這篇文章主要介紹了SQL Server表分區(qū)刪除，刪除分區(qū)又稱為合并分區(qū)，簡單地講就是將多個分區(qū)的數(shù)據(jù)進行合并。現(xiàn)以表Sales.SalesOrderHeader作為示例，演示如何進行表分區(qū)刪除。下面就和小編一起進入文章學習該內(nèi)容吧

一、引言

刪除分區(qū)又稱為合并分區(qū)，簡單地講就是將多個分區(qū)的數(shù)據(jù)進行合并。現(xiàn)以表Sales.SalesOrderHeader作為示例，演示如何進行表分區(qū)刪除。

重要的事情說三遍：備份數(shù)據(jù)庫！備份數(shù)據(jù)庫！備份數(shù)據(jù)庫！

二、演示

2.1、數(shù)據(jù)查詢

2.1.1、 查看分區(qū)元數(shù)據(jù)

SELECT * FROM SYS.PARTITION_FUNCTIONS       --分區(qū)函數(shù)
SELECT * FROM SYS.PARTITION_RANGE_VALUES    --分區(qū)方案

2.1.2、統(tǒng)計每個分區(qū)的數(shù)據(jù)量

SELECT $PARTITION.SalesOrderHeader_OrderDate(OrderDate) AS NUMBER,COUNT(1) AS COUNT
FROM [Sales].[SalesOrderHeader]
GROUP BY $PARTITION.SalesOrderHeader_OrderDate(OrderDate)

分區(qū)表中有數(shù)據(jù)時，是不能夠刪除分區(qū)方案和分區(qū)函數(shù)的，只能將數(shù)據(jù)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(qū)

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(chuàng)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(chuàng)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(shù)據(jù)空間類型

1）對著原表Sales.SalesOrderHeader點擊"右鍵"->"設(shè)計"。

2）點擊菜單欄"視圖"->"屬性窗口"。

3）將數(shù)據(jù)空間類型更改為"文件組"，常規(guī)數(shù)據(jù)空間規(guī)范默認為"PRIMARY"。

2.2.6、移動原表分區(qū)數(shù)據(jù)到臨時表

ALTER TABLE [Sales].[SalesOrderHeader] SWITCH PARTITION 1 TO [Sales].[SalesOrderHeader_Temp] PARTITION 1

2.2.7、創(chuàng)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(qū)方案和分區(qū)函數(shù)

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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