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CREATE PARTITION FUNCTION
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mypartfunction (int)
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AS RANGE LEFT
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FOR VALUES (10,20,30,40,50,60)
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Table 14-1 RANGE LEFT Partition Function
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Partition Number 1 2 3 4 5 6 7
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Min Value - 11 21 31 41 51 61
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Max Value 10 20 30 40 50 60 +
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Table 14-2 shows how the partitions change when the partition function is defined as RANGE RIGHT instead.
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mypartfunction (int)
AS RANGE RIGHT
FOR VALUES (10,20,30,40,50,60)
Table 14-2 RANGE RIGHT Partition Function
Partition Number 1 2
Min Value - 10
Max Value 9
Lesson 2: Archiving by Using Partitions
Table 14-2 RANGE RIGHT Partition Function
Partition Number 3 4 5 6 7
Min Value 20 30 40 50 60
Max Value 29 39 49 59 +
Because the maximum number of partitions for an object is 1,000, you can specify a maximum of 999 boundary points.
NOTE
Code reuse
The definition of a partition function does not provide a clause for an object, column, or storage. This means that a partition function is a stand-alone object that you can apply to multiple tables, indexes, or indexed views if you choose.
Partition Schemes
A partition scheme, which provides an alternate definition for storage, is defined to encompass one or more filegroups. An example of a partition scheme is as follows:
CREATE PARTITION SCHEME mypartscheme
AS PARTITION mypartfunction
TO (Filegroup1, Filegroup2, Filegroup3, Filegroup4, Filegroup5, Filegroup6, Filegroup7)
Each partition scheme must have a name that conforms to the rules for identifiers. The AS PARTITION clause specifies the name of the partition function that will be mapped to the partition scheme. The TO clause specifies the list of filegroups that are included in the partition scheme. A partition scheme must contain at least one filegroup for each partition defined within the partition function. For example, you must map a partition function with six boundary points (seven partitions) to a partition scheme with at least seven filegroups defined. If more filegroups are included in the partition scheme than there are partitions, SQL Server does not use any excess filegroups to store data unless you explicitly specify by using the ALTER PARTITION SCHEME command.
14
Archiving Database Data
Table 14-3 shows how a partition function and partition scheme are mapped.
CREATE PARTITION FUNCTION mypartfunction (int) AS RANGE LEFT FOR VALUES (10,20,30,40,50,60); GO CREATE PARTITION SCHEME mypartscheme AS PARTITION mypartfunction TO (Filegroup1, Filegroup2, Filegroup3, Filegroup4, Filegroup5, Filegroup6, Filegroup7); GO
Table 14-3 Partition Function Mapped to a Partition Scheme
Filegroup Filegroup1 Filegroup2 Filegroup3 Filegroup4 Filegroup5 Filegroup6 Filegroup7
Partition Number 1 2 3 4 5 6 7
Min Value - 11 21 31 41 51 61
Max Value 10 20 30 40 50 60 +
Creating a Partitioned Table
Creating a partitioned table, index, or indexed view is similar to creating a nonparti tioned table, index, or indexed view. Every object that you create has an ON clause that you use to specify where the object is stored. The ON clause is routinely omitted, causing SQL Server to create objects on the default filegroup. Because a partition scheme is just a definition for storage, partitioning a table, index, or indexed view is a straightforward process. An example of a partitioned table is as follows:
CREATE TABLE Employee (EmployeeID FirstName LastName ON mypartscheme(EmployeeID); GO int NOT NULL, varchar(50) NOT NULL, varchar(50) NOT NULL)
Lesson 2: Archiving by Using Partitions
The partitioning key is the ON clause. Instead of specifying a filegroup, you specify a partition scheme. The partition scheme is already defined with a mapping to a parti tion function, so you need to specify the column in the table to which the partition function will be applied. In the preceding example, a table named Employee was cre ated, and the EmployeeID column was used to partition the table based on the defi nition of the partition function that was mapped to the partition scheme on which the table is stored. Table 14-4 shows how the data is partitioned in the Employee table.
CREATE PARTITION FUNCTION mypartfunction (int) AS RANGE LEFT FOR VALUES (10,20,30,40,50,60); GO CREATE PARTITION SCHEME mypartscheme AS PARTITION mypartfunction TO (Filegroup1, Filegroup2, Filegroup3, Filegroup4, Filegroup5, Filegroup6, Filegroup7); GO CREATE TABLE Employee (EmployeeID int NOT NULL, FirstName varchar(50) NOT NULL, LastName varchar(50) NOT NULL) ON mypartscheme(EmployeeID); GO
Table 14-4 Partition Function Mapped to a Partition Scheme
Filegroup Filegroup1 Filegroup2 Filegroup3 Filegroup4 Filegroup5 Filegroup6 Filegroup7
Partition Number 1 2 3 4 5 6 7
Min EmployeeID - 11 21 31 41 51 61
Max EmployeeID 10 20 30 40 50 60 +
Partitioning has an interesting management effect on your tables and indexes. Based on the definition of the partition function and partition scheme, it is possible to deter mine the set of rows that are contained in a given filegroup. By using this information, it is possible to back up and restore a portion of a table as well as manipulate the data in a portion of a table without affecting any other part of the table.
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