Creating Partitions in .NET

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Creating Partitions
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added into the Orderstage table. As long as the Orders and Orderstage tables have the same definition and the same indexes, the only difference is that the data resides in two different tables. Let s say that you go to the last page of the Orders table and change the next page pointer to the first page in the Orderstage table, while also changing the first page in the Orderstage table to the last page in the Orders table. All the pages of the Orderstage table would immediately be associated with the Orders table, and the Orderstage table would have no pages associated with it. This is a very simple example. In practice, the process is slightly more complicated because a table must have at least one page attached to it, but this example explains what occurs. To ensure that a SWITCH operation is infinitely scalable, only a metadata operation occurs when the command is executed. In other words, the operation modifies only page pointers. If SQL Server must move data during this operation, the SWITCH fails. This architecture places several restrictions on a SWITCH operation. Some of these restrictions are as follows:
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A full partition must be switched with an empty partition. Both tables must be aligned (that is, must use the same partition function and partition scheme). Both tables must have exactly the same structure for tables as well as indexes. The range of values in the partition being switched must not exist in the target table.
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SWITCH Requirements
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For the full list of requirements for the SWITCH operation, see the SQL Server 2005 Books Online topic Transferring Data Efficiently by Using Partition Switching. SQL Server 2005 Books Online is installed as part of SQL Server 2005. Updates for SQL Server 2005 Books Online are available for download at www.microsoft.com/technet/prodtechnol/sql/2005/downloads/books.mspx.
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The general syntax for a SWITCH operation is as follows:
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ALTER TABLE [ database_name . [ schema_name ] . | schema_name . ] table_name SWITCH [ PARTITION source_partition_number_expression ] TO [ schema_name. ] target_table [ PARTITION target_partition_number_expression ] [ ; ]
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You can find a specific example of using SWITCH in this lesson s practice.
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Lesson 5: Managing Partitions
Quick Check
What are the three operations you can use to manage partitions, and what is the purpose of each SPLIT introduces a new boundary point for a partition function. MERGE removes a boundary point for a partition function. SWITCH exchanges partitions between two tables.
Quick Check Answer
PRACTICE
Manage Partitions
In this practice, you merge two partitions, split partitions, load data into a staging table, and use the SWITCH operator to merge this data into a master table. 1. If necessary, launch SSMS, connect to your instance, open a new query window, and change the context to the partitiontest database. 2. Combine Partitions 1 and 2 by executing the following command:
ALTER PARTITION FUNCTION partfunc() MERGE RANGE (1000);
3. View the results of this operation by executing the following queries:
SELECT * FROM sys.partitions WHERE object_id = OBJECT_ID('dbo.t1') SELECT $partition.partfunc(id) AS [PartitionNum], count(*) [NumRows] FROM dbo.t1 GROUP BY $partition.partfunc(id) ORDER BY $partition.partfunc(id) GO
4. Add another filegroup to the partition scheme by executing the following command, which also designates that the next partition created be assigned to this filegroup:
ALTER PARTITION SCHEME partscheme NEXT USED [FG4];
Introduce a new boundary point into the partition function:
ALTER PARTITION FUNCTION partfunc() SPLIT RANGE (4000);
View the results of this operation by executing the following queries:
SELECT * FROM sys.partitions WHERE object_id = OBJECT_ID('dbo.t1')
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Creating Partitions
SELECT $partition.partfunc(id) AS [PartitionNum], count(*) [NumRows] FROM dbo.t1 GROUP BY $partition.partfunc(id) ORDER BY $partition.partfunc(id)
7. Create a staging table and add some data to it:
CREATE TABLE dbo.t2 ( id INT , v CHAR(1000) DEFAULT 'bbbb', CONSTRAINT ci_t2_id PRIMARY KEY CLUSTERED (id) , CONSTRAINT check_t2 CHECK (ID>6000) ) ON [FG3] GO --Insert rows into staging table t2. SET NOCOUNT ON DECLARE @i INT, @max INT SELECT @max=MAX(id) + 10 FROM dbo.t1 SET @i= @max WHILE @i<= @max + 6000 - 10 BEGIN INSERT dbo.t2 (id) SELECT @i SET @i=@i+10 END GO
8. Add a new filegroup and file to the database and alter the partition scheme for this new filegroup by executing the following batch:
--Add a new filegroup to the database and add a file to that new filegroup. ALTER DATABASE [partitiontest] ADD FILEGROUP [FG5] GO ALTER DATABASE [partitiontest] ADD FILE ( NAME = db5_dat, FILENAME = 'c:\test\FG5.ndf', SIZE = 2MB) TO FILEGROUP [FG5] GO --Alter the partition scheme to include the newly created and empty --filegroup just added to the database. ALTER PARTITION SCHEME partscheme NEXT USED [FG5]; GO
9. Split the range to introduce a new empty partition, as follows:
ALTER PARTITION FUNCTION partfunc() SPLIT RANGE (6000);
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