SQL Server 2000 Stored Procedure & XML Programming in VS .NET

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SQL Server 2000 Stored Procedure & XML Programming
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[Location] [varchar] (50) NULL , [FirstName] [varchar] (30) NULL , [LastName] [varchar] (30) NULL , [UserName] [varchar] (50) NULL , [EqType] [varchar] (50) NULL , CONSTRAINT [PK_InventoryPrim] PRIMARY KEY ( [Inventoryid] ) ON [PRIMARY] ) ON [PRIMARY] GO CREATE TABLE [dbo].[InventorySec] ( [Inventoryid] [int] NOT NULL , [AcquisitionType] [varchar] (12) NULL , [Address] [varchar] (50) NULL , [City] [varchar] (50) NULL , [ProvinceId] [char] (3) NULL , [Country] [varchar] (50) NULL , [EqType] [varchar] (50) NULL , [Phone] [typPhone] NULL , [Fax] [typPhone] NULL , [Email] [typEmail] NULL , CONSTRAINT [PK_InventorySec] PRIMARY KEY ( [Inventoryid] ) ON [PRIMARY] ) ON [PRIMARY] GO
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The following creates a view that joins them:
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create view vInventoryVertSplit as select IP.Inventoryid, IP.Make, IP.Location, IP.FirstName, IP.UserName, IP.EqType, ISec.Address, ISec.City, ISec.Country, ISec.Phone, ISec.Email from dbo.InventoryPrim IP full join dbo.InventorySec ISec on IP.Inventoryid = ISec.Inventoryid
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IP.Model, IP.LastName, ISec.AcquisitionType, ISec.ProvinceId, ISec.Fax,
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The following creates a query that references only fields from one table:
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SET STATISTICS PROFILE ON SELECT Make, Model, Location, UserName FROM dbo.vInventoryVertSplit where Inventoryid = 1041
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In this case, SQL Server realizes that there is no need to access both tables:
Make Model Location UserName --------- ----------------------------- ------------ ---------Compaq 18.2GB 10K RPM Ultra2 Disk Dr Royal Hotel PMisiaszek (1 row(s) affected) Rows Executes StmtText ---- -------- -------------------------------------------------------1 1 SELECT [Make]=[Make],[Model]=[Model],[Location]=[Locatio 1 1 |--Clustered Index Seek(OBJ:(Asset.dbo.InventoryPrim.P (2 row(s) affected)
Unfortunately, this is not always the case. If we remove criteria from the previous Select statement, SQL Server accesses both tables (although the columns selected are in only one table):
Rows ---980 980 980 980 Executes StmtText -------- -------------------------------------------------------1 SELECT [Make]=[Make],[Model]=[Model],[Location]=[Locatio 1 |--Merge Join(Full Outer Join, MERGE:(InventorySec.Inv 1 |--Clustered Index Scan(OBJ:(Asset.dbo.InventorySec. 1 |--Clustered Index Scan(OBJ:(Asset.dbo.InventoryPrim
NOTE
You can always force SQL Server to use just one table if you reference the table and not the view.
Distributed Partitioned Views
If all base tables of a view are stored on a single server, it is called a local partitioned view. If the underlying tables of a view are stored on separate servers, it is called a distributed partitioned view. Distributed partitioned views are always created on tables
SQL Server 2000 Stored Procedure & XML Programming
that are horizontally partitioned. In the following example, the vSales view on server Alpha references tables on servers Beta and Gamma:
Create view vSales as select * from Sales.dbo.OrderItem2000 UNION ALL select * from Beta.Sales.dbo.OrderItem2001 UNION ALL select * from Gamma.Sales.dbo.OrderItem2002
That s the basic idea, but it is not that simple. I will discuss all the details and then show a complete example. Servers that host horizontally partitioned tables and that work together are called federated servers. This technology is one of the major new features of SQL Server 2000 and it has allowed Microsoft to beat the competition consistently on TPC-C benchmarks since it became available in the Beta version of SQL Server 2000. The strategy of splitting the transaction and query load among a set of distributed servers is often called scaling-out (as opposed to scaling-up, which refers to the brute force method of simply applying bigger and faster hardware instead). Partitioned tables are split based on a partitioning key a column that determines which of the partitioned tables/federated servers the record will fall into. In the previous example, the partitioning key is a year. A partitioning key should be selected to ensure that the majority of queries are served from a single table/server. The success of a federated server project depends largely on the selection of an appropriate partitioning key.
NOTE
You do not have to have multiple physical servers to test federated servers. You can install several instances of SQL Server on the same machine to develop and test the solution. Naturally, it would be pointless to implement federated servers that way in a production environment.
By way of example, assume that your Asset database is serving a Canadian company and that it is functionally divided into three divisions one serves the Canadian market, the second the U.S. market, while the third serves the international market (see Figure 8-13). This schema is very good when reporting is typically done per division. You will partition the table using the Country column as a partitioning key. To assist the resolution of the distributed partitioned view, make Country the first field of the primary key and create Check constraints to prevent entry of records from an
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