Creating Partitions in .NET

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Creating Partitions
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the same way you partition the table. In Lesson 5 of this chapter, we will discuss why this is important. When you create this index, SQL Server stores the portion of the index that corresponds to a CustomerAddressID less than or equal to 1,000 in FG1, stores the portion from 1,001 to 2,000 in FG2, and so on.
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Partitioning an Existing Table or Index
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You can partition an existing table or index without dropping and re-creating the table or index. Instead, if you drop a clustered index and re-create it on another filegroup, SQL Server moves the entire contents of the table into the same filegroup as the clustered index. You can use this process to partition a table or index that already exists by performing the following steps: 1. Create a partition function. 2. Create a partition scheme. 3. Drop the existing clustered index. 4. Re-create the clustered index on the partition scheme. By following this process, the table is automatically partitioned according to the partition scheme that the clustered index is placed on, using the partition function that is mapped to the partition scheme. The clustering key is automatically migrated into each nonclustered index as an included column, and each nonclustered index is partitioned the same way as the table. You can partition each nonclustered index by using a different partition function and scheme than the table. However, you cannot partition the clustered index differently from the table.
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Which clause do you use to partition a table or index You use the ON clause of the CREATE TABLE or CREATE INDEX command to partition tables and indexes, respectively. Instead of specifying a filegroup for this clause, you specify a partition scheme.
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Lesson 3: Partitioning Tables and Indexes
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Create a Partitioned Table
In this practice, you create a partitioned table on the partition scheme you created in Lesson 2. 1. If necessary, launch SSMS, connect to your instance, open a new query window, and change the context to the partitiontest database. 2. Create a partitioned test table by executing the following code, which specifies the partition scheme partscheme in the ON clause:
CREATE TABLE dbo.t1 ( id INT , v CHAR(1000) DEFAULT 'aaaa', CONSTRAINT ci_t1_id PRIMARY KEY CLUSTERED (id)) ON partscheme(id);
3. View the results of executing this command by running the following query:
SELECT * FROM sys.partitions WHERE object_id = OBJECT_ID('dbo.t1');
4. Next, add some rows of data to the table by executing the following batch:
SET NOCOUNT ON DECLARE @i INT SET @i=10 WHILE @i<=3000 BEGIN INSERT dbo.t1 (id) SELECT @i SET @i=@i+10 END GO
5. View the data in the table by executing the following query:
SELECT * from dbo.t1
6. View the state of the partitions by executing the following query:
SELECT * FROM sys.partitions WHERE object_id = OBJECT_ID('dbo.t1');
Lesson Summary
You create partitioned tables and indexes by using the same commands that you use to create unpartitioned tables and indexes: CREATE TABLE and CREATE INDEX. An unpartitioned table or index specifies a filegroup in the commands ON clause. A partitioned table or index specifies a partition scheme in the ON clause.
6
Creating Partitions
Nonclustered indexes can be partitioned using a different partition function and/or partition scheme than the table, but you must partition a clustered index the same way that you partition the table.
Lesson Review
The following questions are intended to reinforce key information presented in this lesson. The questions are also available on the companion CD if you prefer to review them in electronic form.
NOTE
Answers
Answers to these questions and explanations of why each answer choice is right or wrong are located in the Answers section at the end of the book.
Which objects can you partition A. Tables B. Indexes C. Views D. Databases
Lesson 4: Querying Partitions
Lesson 4: Querying Partitions
A nice feature of partitioning is that the process is completely hidden from developers. Data in a table is retrieved and modified in exactly the same way for both partitioned tables and nonpartitioned tables. However, you can query the internals of a partition to determine its structural elements or to restrict a result set to a particular partition. This lesson shows you how to use the $PARTITION function to determine the partition number that a particular value would correspond to or to restrict a query to a specific partition.
After this lesson, you will be able to:
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