This chapter walks you through these tasks and shows you how to query and manage partitions. in .NET framework

Encode PDF417 in .NET framework This chapter walks you through these tasks and shows you how to query and manage partitions.

This chapter walks you through these tasks and shows you how to query and manage partitions.
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Exam objectives in this chapter:
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Implement partitions.
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Lessons in this chapter:
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Lesson 1: Creating a Partition Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210 Lesson 2: Creating a Partition Scheme. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 215 Lesson 3: Partitioning Tables and Indexes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218 Lesson 4: Querying Partitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 223 Lesson 5: Managing Partitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 226
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6
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Creating Partitions
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Before You Begin
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To complete the lessons in this chapter, you must have
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SQL Server 2005 installed
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Real World
Michael Hotek As I was writing this chapter, I received an instant message from one of the mentors within our company: Solid Quality Learning. He was working with a customer on a very large data warehouse and running into problems with the daily data-load operations. The table contained millions of rows of data. Each day, operations would load the most recent set of rows to the table and remove data older than 90 days. Because each operation involved hundreds of thousands or millions of rows, each was a reasonably challenging operation but nothing that using regular insert and delete processes couldn t handle. The real challenge was that the table had a large number of indexes. The customer couldn t drop the indexes for the insert operation because re-creating them would cause several hours of downtime on the table. (The company wasn t aware of the ONLINE option for creating indexes.) Loading the data into the table with the indexes in place required hours, with much of that time spent in index maintenance that also caused severe blocking. Archiving data older than 90 days caused similar problems. If only there were a way to load this data into the table without incurring any of the index maintenance overhead and then incrementally build the portion of the index for the new data. With SQL Server 2005, there is. SQL Server 2005 introduces a feature called table partitioning. By using this feature, regardless of the number of rows inserted, this company could add data to the operational table in less than one second without requiring indexes to be rebuilt or causing any contention. The same process could be applied to archiving the data, which would allow the company to remove as many rows as it wants in less than a second, also without requiring indexes to be rebuilt or incurring any contention. How does this feature work Read Lesson 5, Managing Partitions, in this chapter to find out.
Before You Begin
NOTE
Partitioning and SQL Server Management Studio (SSMS)
Partitioning is one SQL Server 2005 feature that does not have a graphical user interface (GUI) in SSMS. You must use code to perform all operations related to partitions.
6
Creating Partitions
Lesson 1: Creating a Partition Function
A partition function is a stand-alone object in the database that defines the boundary points for partitioning data. Creating a partition function is the first step of partitioning a table, index, or indexed view. These are the only objects that you can partition because they are the only objects that store data in a database. In this lesson, you will see how to create a partition function to define the boundary points for partitioning data.
After this lesson, you will be able to:
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