c# print 2d barcode Lesson 1: Scale Database Applications in .NET framework

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Lesson 1: Scale Database Applications
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necessary. Horizontal partitioning is used to restrict the number of rows within each table. This is a more commonly used form of data partitioning. The table is partitioned by values in one or more of the columns. For example, you could partition the Person.Contacts table based on the Contact ID. In some cases, it might be necessary to combine both types of partitioning to achieve the desired results. How data is partitioned and what data is affected depends on the type of data involved. It also depends on the amount of data coupling that exists between tables. For example, if you have a database that contains several years of customer account data, you might need to move some of that customer data to another database. Typically, all this data will not reside within a single table. It might be spread out among several related tables. Even though you might have a table named Customer, you will need to move data as it relates to a customer entity and not just the single customer record from the Customers table. By moving the data as an entity, you will reduce the need to execute distributed queries and allow queries to be executed faster. Data partitioning is typically just one step in implementing a scale-out solution. It is important to identify the type and amount of data to be partitioned early on. This will help you to select a scale-out technique most appropriate for your application.
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Partition Functions
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Once you have determined what data needs to be moved, you will need to create the additional repositories. This might involve creating databases on separate servers or creating additional filegroups on the same server. If you are creating additional file groups, you will need to use a partition function and partition scheme to specify how tables and indexes are partitioned.
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SQL Server 2005 Enterprise Edition required
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Partition functions can only be created using SQL Server 2005 Enterprise Edition. See the Introduction for instructions on how to install the free 180-day evaluation edition of SQL Server 2005 Enterprise Edition from the companion DVD, if you do not already have a copy installed.
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To demonstrate how partitioning works, assume that you wish to partition the Production.Product table in the AdventureWorks database. The AdventureWorks database includes one file group named PRIMARY that contains one data file and one transaction log file. To partition this database, you could add two filegroups named FG2 and FG3, which contain additional data files. This could be accomplished by using the interface in SQL Server Management Studio or by issuing the following Transact-SQL statements. The path to your database may be different than the following.
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Improving Database Application Performance
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USE [master] GO ALTER DATABASE [AdventureWorks] ADD FILEGROUP [FG2] GO ALTER DATABASE [AdventureWorks] ADD FILE ( NAME = N'AdventureWorks_Data_FG2', FILENAME = N'C:\Program Files\Microsoft SQL Server\MSSQL.8\MSSQL\DATA\AdventureWorks_Data_FG2.ndf' , SIZE = 5120KB , FILEGROWTH = 1024KB ) TO FILEGROUP [FG2] GO ALTER DATABASE [AdventureWorks] ADD FILEGROUP [FG3] GO ALTER DATABASE [AdventureWorks] ADD FILE ( NAME = N'AdventureWorks_Data_FG3', FILENAME = N'C:\Program Files\Microsoft SQL Server\MSSQL.8\MSSQL\DATA\AdventureWorks_Data_FG3.ndf' , SIZE = 5120KB , FILEGROWTH = 1024KB ) TO FILEGROUP [FG3] GO
The partition function is used to define a range of records that will be included in the partition(s). By default, all tables and indexes in SQL Server 2005 are assigned to at least one partition. You can view these partitions by executing a query using the sys.partitions catalog view. The partition function accepts an input parameter type, which in this case will be an integer because you wish to partition the table by Product ID. The function also accepts a range of values that will be used to separate the table into groups. In the following Transact-SQL statement, the partition function is named pfnProduct, and it is used to separate an integer value into three groups. In this case, the ranges will be: less than or equal to 450, 451 to 800, and 801 or greater.
CREATE PARTITION FUNCTION pfnProduct (int) AS RANGE LEFT FOR VALUES (450, 800)
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