教你在SQL Server 2000数据库中使用分区（2）

Microsoft 建议的做法是定义主键，并将事实表设计为本地（单个服务器上）的分区联合视图。大多数情况下，该定义会产生可更新的分区视图，但数据仓库维护应用程序应设计为直接将大多数数据批量加载至成员表（而不是通过视图进行）。

语法示例:

以下代码示例用来说明定义成员表和联合视图以及将数据插入视图的语法：

创建 1999 年事实表:

CREATE TABLE [dbo].[sales_fact_19990101] (
[date_key] [int] NOT NULL
CHECK ([date_key] BETWEEN 19990101 AND 19991231),
[product_key] [int] NOT NULL ,
[customer_key] [int] NOT NULL ,
[promotion_key] [int] NOT NULL ,
[store_key] [int] NOT NULL ,
[store_sales] [money] NULL ,
[store_cost] [money] NULL ,
[unit_sales] [float] NULL
)
ALTER TABLE [sales_fact_19990101]
ADD PRIMARY KEY (
[date_key], [product_key], [customer_key], [promotion_key], [store_key])
 创建 2000 年事实表:

CREATE TABLE [dbo].[sales_fact_20000101] (
[date_key] [int] NOT NULL
CHECK ([date_key] BETWEEN 20000101 AND 20001231),
[product_key] [int] NOT NULL ,
[customer_key] [int] NOT NULL ,
[promotion_key] [int] NOT NULL ,
[store_key] [int] NOT NULL ,
[store_sales] [money] NULL ,
[store_cost] [money] NULL ,
[unit_sales] [float] NULL
)
ALTER TABLE [sales_fact_20000101]
ADD PRIMARY KEY (
[date_key], [product_key], [customer_key], [promotion_key], [store_key])

创建 UNION ALL 视图:

CREATE VIEW [dbo].[sales_fact]
AS
SELECT * FROM [dbo].[sales_fact_19990101]
UNION ALL
SELECT * FROM [dbo].[sales_fact_20000101]

现在插入几行数据，例如：

INSERT INTO [sales_fact]
VALUES (19990125, 347, 8901, 0, 13, 5.3100, 1.8585, 3.0)
INSERT INTO [sales_fact]
VALUES (19990324, 576, 7203, 0, 13, 2.1000, 0.9450, 3.0)
INSERT INTO [sales_fact]
VALUES (19990604, 139, 7203, 0, 13, 5.3700, 2.2017, 3.0)
INSERT INTO [sales_fact]
VALUES (20000914, 396, 8814, 0, 13, 6.4800, 2.0736, 2.0)
INSERT INTO [sales_fact]
VALUES (20001113, 260, 8269, 0, 13, 5.5200, 2.4840, 3.0)

要验证分区是否正常工作，请使用查询分析器来显示查询计划，例如：

SELECT TOP 2 * FROM sales_fact WHERE date_key = 19990324