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看索引内部的总结

原创 Linux操作系统 作者:lfree 时间:2006-02-02 00:00:00 0 删除 编辑

oracle_index_internals.pdf

引用页 http://www.itpub.net/478038.html

Summary Summary
 The vast majority of indexes do not require rebuilding  Oracle B-tree indexes can become “unbalanced” and need to be rebuilt is a myth


 Deleted space in an index is “deadwood” and over time
requires the index to be rebuilt is a myth

 If an index reaches “x” number of levels, it becomes
inefficient and requires the index to be rebuilt is a myth


 If an index has a poor clustering factor, the index needs to be rebuilt is a myth


 To improve performance, indexes need to be regularly
rebuilt is a myth


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