rebuild index and update statistics
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Refer to http://blog.sina.com.cn/s/blog_630d50dc0102vwwh.html
1.UPDATE STATISTICS table with fullscan-->this will update both on index statistics and column statistics
2.Update statistics table with fullscan, index->this will update index statistics
3.Update statistics table with fullscan, column ->this will update column statistics
4.Rebuild indexes(ALTER INDEX on table REBUILD)-> this will only update the indexes statistics.
5.Reorganize indexes(ALTER INDEX on table REORGANIZE)-> this will not update indexes statistics and column statistics
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sql server中index的REBUILD和REORGANIZE