案例18增加测试脚本

18.md

@@ -1,75 +1,82 @@
-delete-wait-lock_mode X locks rec but not gap waiting-vs-insert-wait-lock-mode-s-holds-lock-mode-x-locks-rec-but-not-gap
+delete-wait-lock-mode-x-locks-rec-but-not-gap-vs-insert-wait-lock-mode-s-holds-lock-mode-x-locks-rec-but-not-gap
 ===
+
 ## 死锁特征
 
-1. lock_mode X locks rec but not gap waiting
+1. delete WAITING FOR lock_mode X locks rec but not gap
 2. insert WAITING FOR lock mode S, HOLDS lock_mode X locks rec but not gap
 
 ## 死锁日志
 ```
 ------------------------
 LATEST DETECTED DEADLOCK
 ------------------------
-2019-04-21 22:39:55 0x70000851d000
+2019-04-26 23:52:06 0x7fcb04122700
 *** (1) TRANSACTION:
-TRANSACTION 11158, ACTIVE 12 sec starting index read
+TRANSACTION 2290, ACTIVE 0 sec starting index read
 mysql tables in use 1, locked 1
 LOCK WAIT 2 lock struct(s), heap size 1136, 1 row lock(s)
-MySQL thread id 23, OS thread handle 123145442168832, query id 491 localhost 127.0.0.1 root updating
-delete from t4 where  a = 1
+MySQL thread id 5, OS thread handle 140509923120896, query id 861 localhost root updating
+delete from t18 where id = 4
 *** (1) WAITING FOR THIS LOCK TO BE GRANTED:
-RECORD LOCKS space id 68 page no 3 n bits 72 index PRIMARY of table `aliyun`.`t4` trx id 11158 lock_mode X locks rec but not gap waiting
-Record lock, heap no 2 PHYSICAL RECORD: n_fields 3; compact format; info bits 32
- 0: len 4; hex 80000001; asc ;;
- 1: len 6; hex 000000002b95; asc + ;;
- 2: len 7; hex 6700000199033d; asc g =;;
+RECORD LOCKS space id 24 page no 3 n bits 80 index PRIMARY of table `dldb`.`t18` trx id 2290 lock_mode X locks rec but not gap waiting
+Record lock, heap no 5 PHYSICAL RECORD: n_fields 3; compact format; info bits 32
+ 0: len 4; hex 00000004; asc ;;
+ 1: len 6; hex 0000000008f1; asc   ;;
+ 2: len 7; hex 7a000001ce01ca; asc z  ;;
 
 *** (2) TRANSACTION:
-TRANSACTION 11157, ACTIVE 16 sec inserting
+TRANSACTION 2289, ACTIVE 0 sec inserting
 mysql tables in use 1, locked 1
 3 lock struct(s), heap size 1136, 2 row lock(s), undo log entries 1
-MySQL thread id 22, OS thread handle 123145441890304, query id 492 localhost 127.0.0.1 root update
-insert into t4(a) values(1)
+MySQL thread id 4, OS thread handle 140509923387136, query id 862 localhost root update
+insert into t18 (id) values (4)
 *** (2) HOLDS THE LOCK(S):
-RECORD LOCKS space id 68 page no 3 n bits 72 index PRIMARY of table `aliyun`.`t4` trx id 11157 lock_mode X locks rec but not gap
-Record lock, heap no 2 PHYSICAL RECORD: n_fields 3; compact format; info bits 32
- 0: len 4; hex 80000001; asc ;;
- 1: len 6; hex 000000002b95; asc + ;;
- 2: len 7; hex 6700000199033d; asc g =;;
+RECORD LOCKS space id 24 page no 3 n bits 80 index PRIMARY of table `dldb`.`t18` trx id 2289 lock_mode X locks rec but not gap
+Record lock, heap no 5 PHYSICAL RECORD: n_fields 3; compact format; info bits 32
+ 0: len 4; hex 00000004; asc ;;
+ 1: len 6; hex 0000000008f1; asc   ;;
+ 2: len 7; hex 7a000001ce01ca; asc z  ;;
 
 *** (2) WAITING FOR THIS LOCK TO BE GRANTED:
-RECORD LOCKS space id 68 page no 3 n bits 72 index PRIMARY of table `aliyun`.`t4` trx id 11157 lock mode S waiting
-Record lock, heap no 2 PHYSICAL RECORD: n_fields 3; compact format; info bits 32
- 0: len 4; hex 80000001; asc ;;
- 1: len 6; hex 000000002b95; asc + ;;
- 2: len 7; hex 6700000199033d; asc g =;;
+RECORD LOCKS space id 24 page no 3 n bits 80 index PRIMARY of table `dldb`.`t18` trx id 2289 lock mode S waiting
+Record lock, heap no 5 PHYSICAL RECORD: n_fields 3; compact format; info bits 32
+ 0: len 4; hex 00000004; asc ;;
+ 1: len 6; hex 0000000008f1; asc   ;;
+ 2: len 7; hex 7a000001ce01ca; asc z  ;;
 
 *** WE ROLL BACK TRANSACTION (1)
-------------
 ```
 
 ## 表结构
 
 ```sql
-CREATE TABLE `t4` (
- `a` int(11) NOT NULL AUTO_INCREMENT,
- PRIMARY KEY (`a`)
-) ENGINE=InnoDB
+CREATE TABLE `t18` (
+ `id` int(11) unsigned NOT NULL AUTO_INCREMENT,
+ PRIMARY KEY (`id`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8;
 ```
 
 初始数据：
 
 ```sql
-insert into t4(a) values(1);
+INSERT INTO `t18`(`id`) VALUES (1);
+INSERT INTO `t18`(`id`) VALUES (2);
+INSERT INTO `t18`(`id`) VALUES (3);
+INSERT INTO `t18`(`id`) VALUES (4);
+INSERT INTO `t18`(`id`) VALUES (5);
+INSERT INTO `t18`(`id`) VALUES (6);
+INSERT INTO `t18`(`id`) VALUES (7);
+INSERT INTO `t18`(`id`) VALUES (8);
 ```
 
 ## 重现步骤
 
 | Session 1 | Session 2 |
 | --------- | --------- |
-|delete from t4 where a = 1;//ok, 0 rows affected||
-||delete from t4 where a = 1; //wating,被阻塞|
-|insert into t4 values(1);//Query OK, 1 row affected (0.01 sec)||
+|delete from t18 where id = 4;//ok, 0 rows affected||
+||delete from t18 where id = 4; //wating,被阻塞|
+|insert into t18 values(4);//Query OK, 1 row affected (0.01 sec)||
 | | ERROR 1213 (40001): Deadlock found when trying to get lock;|
 
 ## 分析

README.md

@@ -12,6 +12,7 @@
 |insert|insert|lock_mode X locks gap before rec insert intention|lock_mode X locks gap before rec insert intention|lock_mode X locks gap before rec|14|
 |insert|insert|lock_mode X insert intention|lock_mode X insert intention|lock_mode S|2|
 |insert|insert|lock mode S|lock_mode X locks gap before rec insert intention|lock_mode X locks rec but not gap|15|
+|delete|insert|lock_mode X locks rec but not gap|lock mode S|lock_mode X locks rec but not gap|18|
 |delete|delete|lock_mode X|lock mode S|lock_mode X locks rec but not gap|4|
 |delete|delete|lock_mode X|lock mode X|lock_mode X locks rec but not gap|6|
 |delete|delete|lock_mode X locks rec but not gap|lock_mode X|lock_mode X|3|
@@ -24,7 +25,6 @@
 |update|update|lock_mode X locks rec but not gap|lock mode S|lock_mode X locks rec but not gap|11|
 |update|update|lock_mode X|lock_mode X locks gap before rec insert intention|lock_mode X locks rec but not gap|16|
 |update|update|lock_mode X locks gap before rec insert intention|lock_mode X locks gap before rec insert intention|lock_mode X|17|
-|delete|insert|lock mode S|lock_mode X locks rec but not gap||18|
 
 表中的语句虽然大多数只列出了 delete 和 insert，但实际上绝大多数的 delete 语句和 update 或 select ... for update 加锁机制是一样的，所以为了避免重复，对于 update 语句就不在一起汇总了（当然也有例外，譬如使用 update 对索引进行更新时加锁机制和 delete 是有区别的，这种情况我会单独列出，如案例 11）。
 

docker/db/t18.sql

@@ -0,0 +1,22 @@
+CREATE DATABASE /*!32312 IF NOT EXISTS*/`dldb` /*!40100 DEFAULT CHARACTER SET utf8 COLLATE utf8_unicode_ci */;
+
+USE `dldb`;
+
+CREATE TABLE `t18` (
+ `id` int(11) unsigned NOT NULL AUTO_INCREMENT,
+ PRIMARY KEY (`id`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8;
+
+INSERT INTO `t18`(`id`) VALUES (1);
+INSERT INTO `t18`(`id`) VALUES (2);
+INSERT INTO `t18`(`id`) VALUES (3);
+INSERT INTO `t18`(`id`) VALUES (4);
+INSERT INTO `t18`(`id`) VALUES (5);
+INSERT INTO `t18`(`id`) VALUES (6);
+INSERT INTO `t18`(`id`) VALUES (7);
+INSERT INTO `t18`(`id`) VALUES (8);
+
+/*
+mysqlslap --create-schema dldb -q "begin; delete from t18 where id = 4; insert into t18 (id) values (4); rollback;" --number-of-queries=100000 -uroot -p123456 &
+mysqlslap --create-schema dldb -q "begin; delete from t18 where id = 4; rollback;" --number-of-queries=100000 -uroot -p123456 &
+*/