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本文主要总结了关于Mysql中索引的操作，主要涉及索引的查看，增加和删除。
http://dev.mysql.com/doc/refman/5.7/en/show-index.html
SHOW {INDEX | INDEXES | KEYS} {FROM | IN} tbl_name [{FROM | IN} db_name] [WHERE expr]
http://dev.mysql.com/doc/refman/5.7/en/create-index.html
CREATE [UNIQUE|FULLTEXT|SPATIAL] INDEX index_name [index_type] ON tbl_name (index_col_name,...) [index_option] [algorithm_option | lock_option] ... index_col_name: col_name [(length)] [ASC | DESC] index_type: USING {BTREE | HASH} index_option: KEY_BLOCK_SIZE [=] value | index_type | WITH PARSER parser_name | COMMENT ‘string‘ algorithm_option: ALGORITHM [=] {DEFAULT|INPLACE|COPY} lock_option: LOCK [=] {DEFAULT|NONE|SHARED|EXCLUSIVE}
http://dev.mysql.com/doc/refman/5.7/en/drop-index.html
DROP INDEX index_name ON tbl_name [algorithm_option | lock_option] ... algorithm_option: ALGORITHM [=] {DEFAULT|INPLACE|COPY} lock_option: LOCK [=] {DEFAULT|NONE|SHARED|EXCLUSIVE}
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原文地址：http://www.cnblogs.com/zhouweihit/p/4742588.html
