http://blog.ccidnet.com/blog-htm-do-showone-uid-51502-type-blog-itemid-153572.html

http://www.cnblogs.com/rootq/archive/2008/11/16/1334601.html

http://www.knowsky.com/389180.html



http://oraclespace.bokee.com/viewdiary.15774436.html


index ffs,table full can使用的是连续读, index range scan是单快读, 数据量差不多时,当然连续读快了？？？

http://space.itpub.net/6679/spacelist-blog-itemtypeid-10162