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Clustered indexes have one row in sys.partitions, with index_id = 1 for each partition used by the index. By default, a clustered index has a single partition. When a clustered index has multiple partitions, each partition has a B-tree structure that contains the data for that specific partition. For example, if a clustered index has four partitions, there are four B-tree structures, one in each partition. Depending on the data types in the clustered index, each clustered index structure will have one or more allocation units in which to store and manage the data for a specific partition. At a minimum, each clustered index will have one IN_ROW_DATA allocation unit per partition. The clustered index will also have one LOB_DATA allocation unit per partition if it contains large object (LOB) columns. It will also have one ROW_OVERFLOW_DATA allocation unit per partition if it contains variable-length columns that exceed the 8,060-byte row size limit.
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SQL Server 2005 Architecture and Internals
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The pages in the data chain and the rows in them are ordered on the value of the clustered index key. All inserts are made at the point where the key value in the inserted row fits in the ordering sequence among existing rows. For a clustered index, the root_page column in sys.system_internals_allocation_units points to the top of the clustered index for a specific partition. SQL Server moves down the index to find the row corresponding to a clustered index key. To find a range of keys, SQL Server moves through the index to find the starting key value in the range and then scans through the data pages using the previous or next pointers. To find the first page in the chain of data pages, SQL Server follows the leftmost pointers from the root node of the index.
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Non-Clustered Index Structures
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Non-clustered indexes are very similar in structure to clustered indexes with the following key differences:
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The data rows of the underlying table are not sorted and stored in order based on their non-clustered keys. The leaf layer of a non-clustered index is made up of index pages instead of data pages.
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non-clustered indexes can be defined on a table or view with a clustered index or a heap. Each index row in the non-clustered index contains the non-clustered key value and a row locator. This locator points to the data row in the clustered index or heap having the key value. The row locators in non-clustered index rows are either a pointer to a row or are a clustered index key for a row, as explained below:
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If the table is a heap, which means it does not have a clustered index, the row locator is a pointer to the row. The pointer is built from the file identifier (ID), page number, and number of the row on the page. The whole pointer is known as a Row ID (RID). If the table has a clustered index, or the index is on an indexed view, the row locator is the clustered index key for the row. If the clustered index is not a unique index, SQL Server 2005 makes any duplicate keys unique by adding an internally generated value called a uniqueifier. This four-byte value is not visible to users. It is only added when required to make the clustered key unique for use in non-clustered indexes. SQL Server retrieves the data row by searching the clustered index using the clustered index key stored in the leaf row of the non-clustered index.
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Appendix B
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Non-clustered indexes have one row in sys.partitions with index_id >1 for each partition used by the index. By default, a non-clustered index has a single partition. When a non-clustered index has multiple partitions, each partition has a B-tree structure that contains the index rows for that specific partition. For example, if a non-clustered index has four partitions, there are four B-tree structures, with one in each partition. Depending on the data types in the non-clustered index, each non-clustered index structure will have one or more allocation units in which to store and manage the data for a specific partition. At a minimum, each non-clustered index will have one IN_ROW_DATA allocation unit per partition that stores the index B-tree pages. The NonClustered index will also have one LOB_DATA allocation unit per partition if it contains large object (LOB) columns. Additionally, it will have one ROW_OVERFLOW_DATA allocation unit per partition if it contains variablelength columns that exceed the 8,060-byte row size limit. For more information about allocation units, see Table and Index Organization at http://msdn2.microsoft.com/en-us/library /ms189051.aspx. The page collections for the B-tree are anchored by root_page pointers in the sys.system_internals_allocation_units system view.
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