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Microsoft SQL Server 2008 Internals
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As mentioned earlier, every index is created with a speci c llfactor. The initial llfactor value is stored with the index metadata, so when defragmenting is requested, SQL Server can inspect this value. During defragmentation, SQL Server attempts to reestablish the initial llfactor if it is greater than the current llfactor on a leaf-level page. Defragmentation is designed to compact data, and this can be done by putting more rows per page and increasing the fullness percentage of each page. SQL Server might end up then removing pages from the index after the defragmentation. If the current llfactor is greater than the initial llfactor, SQL Server cannot reduce the fullness level of a page by moving rows out of it. The compaction algorithm inspects adjacent pages (in logical order) to see if there is room to move rows from the second page to the rst. From SQL Server 2005 onwards, the process is even more ef cient by looking at a sliding window of eight logically consecutive pages. It determines whether enough rows can be moved around within the eight pages to allow a single page to be emptied and removed, and moves rows only if this is the case. As mentioned earlier, SQL Server 2005 also introduced the option to compact your LOB pages. The default is ON. Reorganizing a speci ed clustered index compacts all LOB columns that are contained in the clustered index before it compacts the leaf pages. Reorganizing a nonclustered index compacts all LOB columns that are non-key (INCLUDEd) columns in the index. In SQL Server 2000, the only way a user can compact LOBs in a table is to unload and reload the LOB data. LOB compaction in SQL Server 2005 onwards nds low-density extents those that are used at less than 75 percent. It moves pages out of these low-density uniform extents and places the data from them in available space in other uniform extents already allocated to the LOB allocation unit. This functionality allows much better use of disk space, which can be wasted with low-density LOB extents. No new extents are allocated, either during this compaction phase or during the next phase. The second phase of the reorganization operation actually moves data to new pages in the in-row allocation unit with the goal of having the logical order of data match the physical order. The index is kept online because only two pages at a time are processed in an operation similar to a heapsort or smoothsort (the details of which are beyond the scope of this book). The following example is a simpli cation of the actual process of reorganization. Consider an index on a column of datetime data. Monday s data logically precedes Tuesday s data, which precedes Wednesday s data, which precedes Thursday s data, and so on. If, however, Monday s data is on page 88, Tuesday s is on page 50, Wednesday s is on page 100, and Thursday s is on page 77, the physical and logical ordering doesn t match in the slightest, and we have logical fragmentation. When defragmenting an index, SQL Server determines the rst physical page belonging to the leaf level (page 50, in our case) and the rst logical page in the leaf level (page 88, which holds Monday s data) and swaps the data on those two pages using one additional new page as a temporary storage area. After this swap, the rst logical page with Monday s data is on page 50, the lowest numbered physical page. After each page swap, all locks and latches are released and the key of the last page moved is saved. The next iteration of the algorithm uses the saved key to nd the next logical page Tuesday s data, which is now on page 88. The next physical page is 77, which holds Thursday s data. So another
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