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Archiving Database Data
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CONSTRAINT pk_orders PRIMARY KEY CLUSTERED (OrderDate,OrderID))
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ON partscheme(OrderDate)
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8. Populate some data into the Orders table by executing the following code:
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SET NOCOUNT ON
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DECLARE @month int,
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@day int
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SET @month = 1
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SET @day = 1
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WHILE @month <= 12 BEGIN
WHILE @day <= 28
BEGIN
INSERT dbo.orders (OrderDate, OrderAmount) SELECT cast(@month as varchar(2)) + '/' + cast(@day as varchar(2)) + '/2005', @day * 20 SET @day = @day + 1
SET @day = 1 SET @month = @month + 1
9. View the basic data distribution by executing the following:
SELECT * FROM sys.partitions
WHERE object_id = OBJECT_ID('dbo.orders')
10. Return the data for a specific partition by executing the following:
SELECT * FROM dbo.orders
WHERE $partition.partfunc(OrderDate)=4
Exercise 2: Sliding Window Scenario
In this exercise, you use the SPLIT, MERGE, and SWITCH operators to remove data from a table so that it can be archived without affecting query performance on the operational table. The Orders table was previously set up with 12 months of order data. Using the SPLIT operation, you create a new partition for the month of January 2006. Using the SWITCH function, you remove the partition for January 2005 so that it can be archived. Using the MERGE function, you eliminate the boundary point for January 2005.
Lesson 2: Archiving by Using Partitions
After following the instructions for the previous practice, the data in the Orders table should be as follows:
Table 14-5 Orders Table Data Distribution
Filegroup FG1 FG2 FG3 FG4 FG5 FG6 FG7 FG8 FG9 FG10 FG11 FG12 FG13
Min Date - 1/1/2005 2/1/2005 3/1/2005 4/1/2005 5/1/2005 6/1/2005 7/1/2005 8/1/2005 9/1/2005 10/1/2005 11/1/2005 12/1/2005
Max Date 12/31/2004 1/31/2005 2/28/2005 3/31/2005 4/30/2005 5/31/2005 6/30/2005 7/31/2005 8/31/2005 9/30/2005 10/31/2005 11/30/2005 +
1. Alter the partition scheme to set the NEXT USED flag on FG1:
ALTER PARTITION SCHEME partscheme
NEXT USED [FG1];
2. Introduce a new boundary point for January 2006:
ALTER PARTITION FUNCTION partfunc()
SPLIT RANGE ('1/1/2006');
3. Create an archive table for the January 2005 orders:
CREATE TABLE dbo.ordersarchive ( OrderID int NOT NULL, OrderDate datetime NOT NULL CONSTRAINT ck_orderdate CHECK (OrderDate<'2/1/2005'),
14
Archiving Database Data
OrderAmount money NOT NULL CONSTRAINT pk_ordersarchive PRIMARY KEY CLUSTERED (OrderDate,OrderID) )
ON FG2
4. Use the SWITCH operator to detach the January 2005 partition from the Orders table and attach it to the OrdersArchive table:
ALTER TABLE dbo.orders
SWITCH PARTITION 2 TO dbo.ordersarchive
5. Remove the boundary point for January 2005:
ALTER PARTITION FUNCTION partfunc()
MERGE RANGE ('1/1/2005');
6. Verify the contents of the Orders and OrdersArchive tables.
Lesson Summary
Partitioning enables you to split the data in a table into multiple storage struc tures. A partition function defines the boundary points by which SQL Server partitions that data. A partition scheme maps to a partition function and provides the physical stor age structure. You use the SPLIT, MERGE, and SWITCH operators to manage partitions.
Lesson Review
You can use the following questions to test your knowledge of the information pre sented in Lesson 2, Archiving by Using Partitions. 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.
1. Contoso Limited has a very high volume order-entry system. Management has determined that orders should be maintained in the operational system for a maximum of six months before being archived. After data is archived from the
Lesson 2: Archiving by Using Partitions
table, it is loaded into the data warehouse. The data load occurs once per month. Which technology is the most appropriate choice for archiving data from the order entry system A. Database Mirroring B. Transactional replication C. Database Snapshots D. Partitioning
14 Review
Review
To further practice and reinforce the skills you learned in this chapter, you can per form the following tasks:
Review the chapter summary. Review the list of key terms introduced in this chapter. Complete the case scenario. This scenario sets up a real-world situation involv ing the topics of this chapter and asks you to create solutions. Complete the suggested practices. Take a practice test.
Summary
Archiving is the process of removing data from a production database server and then storing that data in a medium designed for long-term, infrequent access. There are many good reasons to archive data, including compliance with legal regulations and the improved manageability and performance of production databases. If you need to archive data, first determine which data to archive. Then deter mine where to store the archived data. Finally, determine how best to move the data from its current location into the archive. Partitioning enables the data in a table to be split into multiple storage struc tures. The SPLIT, MERGE, and SWITCH operators are used to manage partitions.
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