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Microsoft SQL Server 2008 Internals
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The partition function and partition scheme for a second table are shown here:
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CREATE PARTITION FUNCTION [TransactionArchivePF2] (datetime) AS RANGE RIGHT FOR VALUES ('20080901'); GO CREATE PARTITION SCHEME [TransactionArchivePS2] AS PARTITION [TransactionArchivePF2] TO ([PRIMARY], [PRIMARY]); GO
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My script then creates two tables and loads data into them. I will not include all the details here. To partition a table, you must specify a partition scheme in the CREATE TABLE statement. I create a table called TransactionArchive that includes this line as the last part of the CREATE TABLE statement as follows:
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ON [TransactionsPS1] (TransactionDate)
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My second table, TransactionArchiveHistory, is created using the TransactionsPS1 partitioning scheme. My script then loads data into the two tables, and because the partition scheme has already been de ned, each row is placed in the appropriate partition as the data is loaded. After the tables are loaded, we can examine the metadata.
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Metadata for Partitioning
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Figure 7-16 shows most of the catalog views for retrieving information about partitions. Along the left and bottom edges, you can see the sys.tables, sys.indexes, sys.partitions, and sys.allocation_units catalog views that I ve discussed previously in this chapter.
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0..* LOB data space 1 Heap or B-tree data space 0..1
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sys.tables 1
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sys.data_spaces
1..*
0..* sys.indexes 1 sys.partition_schemes 0..* 1 sys.partition_functions 1..3 1..* sys.partitions 1 +partition_id +container_id sys.allocation_units 0..* 1* sys.destination_data_spaces * 1 sys.filegroups 1
FIGURE 7-16 Catalog views containing metadata for partitioning and data storage
7
Special Storage
In some of my queries, I am using the undocumented sys.system_internals_allocation_units view instead of sys.allocation_units to retrieve page address information. Here, I ll describe the most relevant columns of each of these views:
sys.data_spaces has a primary key called data_space_id, which is either a partition ID or a legroup ID, and there is one row for each legroup and one row for each partition scheme. One of the columns in sys.data_spaces speci es to which type of data space the row refers. If the row refers to a partition scheme, data_space_id can be joined with sys.partition_schemes.data_space_id. If the row refers to a legroup, data_space_id can be joined with sys. legroups.data_space_id. The sys.indexes view also has a data_space_id column to indicate how each heap or B-tree stored in sys.indexes is stored. So, if we know that a table is partitioned, we can directly join it with sys.partition_schemes without going through sys.data_spaces. Alternatively, you can use the following query to determine whether a table is partitioned by replacing Production.TransactionHistoryArchive with the name of the table in which you re interested:
SELECT DISTINCT object_name(object_id) as TableName, ISNULL(ps.name, 'Not partitioned') as PartitionScheme FROM (sys.indexes i LEFT JOIN sys.partition_schemes ps ON (i.data_space_id = ps.data_space_id)) WHERE (i.object_id = object_id('Production.TransactionHistoryArchive')) AND (i.index_id IN (0,1));
sys.partition_schemes has one row for each partition scheme. In addition to the data_ space_id and the name of the partition scheme, it has a function_id column to join with sys.partition_functions. sys.destination_data_spaces is a linking table because sys.partition_schemes and sys. legroups are in a many-to-many relationship with each other. For each partition scheme, there is one row for each partition. The partition number is in the destination_id column, and the legroup ID is stored in the data_space_id column. sys.partition_functions contains one row for each partition function, and its primary key function_id is a foreign key in sys.partition_schemes. sys.partition_range_values (not shown) has one row for each endpoint of each partition function. Its function_id column can be joined with sys.partition_functions, and its boundary_id column can join with either partition_id in sys.partitions or with destination_id in sys.destination_data_spaces.
These views have other columns that I haven t mentioned, and there are additional views that provide information, such as the columns and their data types that the partitioning is based on. However, the preceding information should be suf cient to understand Figure 7-15 and the view shown in the next block of code. This view returns information about each partition of each partitioned table. The WHERE clause lters out partitioned indexes (other than the clustered index), but you can change that condition if you desire. When selecting from the
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