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System Architecture of SQL Server
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A nonclustered index
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Internally, SQL Server always ensures that clustered indexes are unique by adding a 4-byte, universally unique identifier (UUID) to clustered index key values that occur more than once. This UUID becomes part of the key and is used in all levels of the clustered index and in references to the clustered index key through all nonclustered indexes.
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Since SQL Server maintains ordering in index leaf levels, you do not need to unload and reload data to maintain clustering properties as data is added and moved. SQL Server will always insert rows into the correct page in clustered sequence. For a clustered index, the correct leaf page is the data page in which a row will be inserted. For a nonclustered index, the correct leaf page is the one into which SQL Server inserts a row containing the key value (and data row locator) for the newly inserted row. If data is updated and the key values of an index change, or if the row is moved to a different page, SQL Server s transaction control ensures that all affected indexes are modified to reflect these changes. Under transaction control, index operations are performed as atomic operations. The operations are logged and fully recovered in the event of a system failure.
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As we will see in the section on the lock manager, pages of an index use a slightly different locking mechanism than regular data pages.
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2:
System Architecture of SQL Server
A lightweight lock called a latch is used to lock upper levels of indexes. Latches are not involved in deadlock detection because SQL Server 2000 uses deadlock-proof algorithms for index maintenance. You can customize the locking strategy for indexes on a table basis or index basis. The system stored procedure sp_indexoption lets you enable or disable page or row locks with any particular index or, by specifying a table name, for every index on that table. The settable options are AllowPageLocks and AllowRowLocks. If both of these options are set to FALSE for a particular index, only table-level locks are applied.
The Page Manager and the Text Manager
The page manager and the text manager cooperate to manage a collection of pages as named databases. Each database is a collection of 8K disk pages, which are spread across one or more physical files. (In the next chapter, you will find more details about the physical organization of databases.) SQL Server uses six types of disk pages: data pages, text/image pages, index pages, Page Free Space (PFS) pages, Global Allocation Map (GAM and SGAM) pages, and Index Allocation Map (IAM) pages. All user data, except for the text and image datatypes, are stored on data pages. The text and image datatypes, which are used for storing large objects (up to 2GB each of text or binary data), use a separate collection of pages, so the data is not stored on regular data pages with the rest of the rows. A pointer on the regular data page identifies the starting page and offset of the text/image data. Index pages store the B-trees that allow fast access to data. PFS pages keep track of which pages in a database are available to hold new data. Allocation pages (GAMs, SGAMs, and IAMs) keep track of the other pages; they contain no database rows and are used only internally. The page manager allocates and deallocates all types of disk pages, organizing extents of eight pages each. An extent can be either a uniform extent, for which all eight pages are allocated to the same object (table or index), or a mixed extent, which can contain pages from multiple objects. If an object uses fewer than eight pages, the page manager allocates new pages for that object from mixed extents.
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