oracle索引 相关

https://blog.csdn.net/cn_chenfeng/article/details/1794471?utm_medium=distribute.pc_relevant.none-task-blog-2~default~baidujs_baidulandingword~default-1-1794471-blog-116321032.235^v43^pc_blog_bottom_relevance_base4&spm=1001.2101.3001.4242.2&utm_relevant_index=4