How can I analyze the results of the sql query : dbcc showcontig to improve the performance of sql?
How can I analyze the results of the sql query : dbcc showcontig to
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How can I analyze the results of the sql query : dbcc showcontig to improve the performance of sql?
The results from SHOWCONTIG are relevant only if you have a clustered index on the table. Books Online has a nice section about this.
Depending on the fragmentation level (~20% – 30%), you will decide whether to simply defrag the indexes, or rebuild them completely. This also depends on the number of changed rows, the total number of data pages, etc.
If you choose to defrag the indexes, remember to update your statistics as a separate step. This happens automatically when you rebuild.