MYSQL 索引页 结构图

create table t( a int() not null auto_increment,b char() default null,primary key(a));

mysql> select * from t;
+----+------+
| a  | b    |
+----+------+
|   | aaa  |
|   | bbb  |
|   | ccc  |
|   | ddd  |
|   | eee  |
|   | fff  |
|   | ggg  |
|   | hhh  |
|   | iii  |
|  | jjj  |
+----+------+
 rows in set (0.00 sec)

hexdump -C t.ibd

锁结构与索引页对比

RECORD LOCKS space id  page no  n bits  index `PRIMARY` of table `test`.`t` trx id  lock_mode X
Record lock, heap no  PHYSICAL RECORD: n_fields ; compact format; info bits
 : len ; hex 73757072656d756d; asc supremum;;

Record lock, heap no  PHYSICAL RECORD: n_fields ; compact format; info bits
 : len ; hex ; asc     ;;
 : len ; hex 000000007c12; asc     | ;;
 : len ; hex 8f000001460110; asc     F  ;;
 : len ; hex ; asc aaa;;

Record lock, heap no  PHYSICAL RECORD: n_fields ; compact format; info bits
 : len ; hex ; asc     ;;
 : len ; hex 000000007c13; asc     | ;;
 : len ; hex 90000001b70110; asc        ;;
 : len ; hex ; asc bbb;;

Record lock, heap no  PHYSICAL RECORD: n_fields ; compact format; info bits
 : len ; hex ; asc     ;;
 : len ; hex 000000007c18; asc     | ;;
 : len ; hex 93000001b80110; asc        ;;
 : len ; hex ; asc ccc;;

Record lock, heap no  PHYSICAL RECORD: n_fields ; compact format; info bits
 : len ; hex ; asc     ;;
 : len ; hex 000000007c19; asc     | ;;
 : len ; hex 940000020a0110; asc        ;;
 : len ; hex ; asc ddd;;

Record lock, heap no  PHYSICAL RECORD: n_fields ; compact format; info bits
 : len ; hex ; asc     ;;
 : len ; hex 000000007c1a; asc     | ;;
 : len ; hex 950000014b0110; asc     K  ;;
 : len ; hex ; asc eee;;

Record lock, heap no  PHYSICAL RECORD: n_fields ; compact format; info bits
 : len ; hex ; asc     ;;
 : len ; hex 000000007c1b; asc     | ;;
 : len ; hex 960000014c0110; asc     L  ;;
 : len ; hex ; asc fff;;

Record lock, heap no  PHYSICAL RECORD: n_fields ; compact format; info bits
 : len ; hex ; asc     ;;
 : len ; hex 000000007c20; asc     | ;;
 : len ; hex 99000001a10110; asc        ;;
 : len ; hex ; asc ggg;;

Record lock, heap no  PHYSICAL RECORD: n_fields ; compact format; info bits
 : len ; hex ; asc     ;;
 : len ; hex 000000007c21; asc     |!;;
 : len ; hex 9a0000014f0110; asc     O  ;;
 : len ; hex ; asc hhh;;

Record lock, heap no  PHYSICAL RECORD: n_fields ; compact format; info bits
 : len ; hex ; asc     ;;
 : len ; hex 000000007c22; asc     |";;
 : len ; hex 9b000001500110; asc     P  ;;
 : len ; hex ; asc iii;;

Record lock, heap no  PHYSICAL RECORD: n_fields ; compact format; info bits
 : len ; hex 8000000a; asc     ;;
 : len ; hex 000000007c23; asc     |#;;
 : len ; hex 9c000001a40110; asc        ;;
 : len ; hex 6a6a6a; asc jjj;;