One: Four storage engines:
MySQL uses show engines to query its storage engine;
| Function | MYISAM | Memory | InnoDB | Archive |
| storage limit | 256TB | RAM | 64TB | None |
| support things | No | No | Yes | No |
| Full-text indexing support | Yes | No | No | No |
| index of support | Yes | Yes | Yes | No |
| Support hash index | No | Yes | No | No |
| Support data cache | No | N/A | Yes | No |
| Support foreign keys | No | No | Yes | No |
two:
1: Common operations and index operations of Mysql: http://www.cnblogs.com/whgk/category/916860.html
2: The data structure and algorithm principle of Mysql index: http://www.uml.org.cn/sjjm/201107145.asp#nav-2
3: Introduction of various indexes: http://www.cnblogs.com/xiangyangzhu/p/index.html