What happens inside ...... when fired Index Reorganize

Hi all,
what happens inside ...... when fired Index Reorganize
Thanks
vijay

Logical scan fragmentation is removed (where possible). This can improve performance of certain queries, because it reduces the amount of big disk head movements need to go through all the pages.
In addition to that, it brings the amount of unused space in line with the original fill factor of the index. If you haven't specified any fill factor when the index was first created, then all unused space will be removed (where possible). It does this
by joining the rows of multiple pages onto fewer pages and releasing the empty pages. This can improve performance of many queries, since fewer I/O and less memory is now needed to access the same amount of row data.
When the command runs, it will lock just one or a few pages at a time. This way, most blocking is avoided, and any blocking that does occur will be short lived.
This also means that the reorganization occurs inline, within the pages and extents that are already allocated for the specific index. This is one of the big differences with Reindexing, where new pages (and extents) are allocated.
Gert-Jan

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*Assign points for Useful Answers*
Message was edited by: S.P
Message was edited by: S.P
Message was edited by: S.P

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What happens inside ...... when fired Index Reorganize

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