mysql 学习记录（十三）--事务与表锁
一、备注：
1.host1：主机1
2.host2：主机2
二、实践：
host1:
mysql> use test1;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> lock table film_text read;
Query OK, 0 rows affected (0.00 sec)
mysql> select film_id,title from film_text where film_id = 1;
+---------+-----------+
| film_id | title |
+---------+-----------+
| 1 | film_name |
| 1 | film_name |
+---------+-----------+
2 rows in set (0.00 sec)
host2:
mysql> use test1;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> select film_id,title from film_text where film_id = 1;
+---------+-----------+
| film_id | title |
+---------+-----------+
| 1 | film_name |
| 1 | film_name |
+---------+-----------+
2 rows in set (0.00 sec)
mysql> update film_text set title='title_update' where film_id = 1;
^CCtrl-C -- sending "KILL QUERY 112" to server ...
Ctrl-C -- query aborted.
ERROR 1317 (70100): Query execution was interrupted
host1:
mysql> unlock tables;
Query OK, 0 rows affected (0.00 sec)
host2:
mysql> update film_text set title='title_update' where film_id = 1;
Query OK, 2 rows affected (0.00 sec)
Rows matched: 2 Changed: 2 Warnings: 0
mysql> select * from film_text;
+---------+--------------------+--------------------------+
| film_id | title | description |
+---------+--------------------+--------------------------+
| 1 | title_update | film_description |
| NULL | before insert | NULL |
| NULL | after insert | NULL |
| NULL | before insert | NULL |
| NULL | after insert | NULL |
| NULL | before insert | NULL |
| 111 | test_trigger_title | test_trigger_description |
| 111 | test_trigger_title | test_trigger_description |
| 1 | title_update | film_description |
+---------+--------------------+--------------------------+
9 rows in set (0.00 sec)
host1:
mysql> select * from actor where actor_id = 1;
+----------+------------+-----------+
| actor_id | first_name | last_name |
+----------+------------+-----------+
| 1 | Test | 1 |
+----------+------------+-----------+
1 row in set (0.00 sec)
mysql> start transaction;
Query OK, 0 rows affected (0.00 sec)
host2:
mysql> select * from actor where actor_id = 235;
^CCtrl-C -- sending "KILL QUERY 112" to server ...
Ctrl-C -- query aborted.
ERROR 1317 (70100): Query execution was interrupted
host1:
mysql> insert into actor(actor_id,first_name,last_name)
-> values ('235','List','Tom');
Query OK, 1 row affected (0.00 sec)
mysql> select * from actor;
+----------+------------+-----------+
| actor_id | first_name | last_name |
+----------+------------+-----------+
| 1 | Test | 1 |
| 201 | Test | 201 |
| 235 | List | Tom |
+----------+------------+-----------+
3 rows in set (0.00 sec)
host2:
mysql> select * from actor where actor_id = 235;
^CCtrl-C -- sending "KILL QUERY 112" to server ...
Ctrl-C -- query aborted.
ERROR 1317 (70100): Query execution was interrupted
host1:
mysql> commit;
Query OK, 0 rows affected (0.01 sec)
mysql> select * from actor;
+----------+------------+-----------+
| actor_id | first_name | last_name |
+----------+------------+-----------+
| 1 | Test | 1 |
| 201 | Test | 201 |
| 235 | List | Tom |
+----------+------------+-----------+
3 rows in set (0.00 sec)
host2:
mysql> select * from actor ;
+----------+------------+-----------+
| actor_id | first_name | last_name |
+----------+------------+-----------+
| 1 | Test | 1 |
| 201 | Test | 201 |
| 235 | List | Tom |
+----------+------------+-----------+
5 rows in set (0.00 sec)
host1:
mysql> start transaction;
Query OK, 0 rows affected (0.00 sec)
mysql> insert into actor(actor_id,first_name,last_name) values ('236','List','Tom');
Query OK, 1 row affected (0.00 sec)
mysql> commit;
Query OK, 0 rows affected (0.00 sec)
mysql> select * from actor where actor_id = 235;
+----------+------------+-----------+
| actor_id | first_name | last_name |
+----------+------------+-----------+
| 235 | List | Tom |
+----------+------------+-----------+
1 row in set (0.00 sec)
mysql> lock table actor write;
Query OK, 0 rows affected (0.00 sec)
host2:
mysql> select * from actor where actor_id = 235;
^CCtrl-C -- sending "KILL QUERY 112" to server ...
Ctrl-C -- query aborted.
host1:
mysql> select * from actor;
+----------+------------+-----------+
| actor_id | first_name | last_name |
+----------+------------+-----------+
| 1 | Test | 1 |
| 201 | Test | 201 |
| 235 | List | Tom |
| 236 | List | Tom |
+----------+------------+-----------+
4 rows in set (0.01 sec)
mysql> insert into actor(actor_id,first_name,last_name)
-> values ('237','Abc','Def');
Query OK, 1 row affected (0.01 sec)
mysql> commit;
Query OK, 0 rows affected (0.00 sec)
mysql> select * from actor;
+----------+------------+-----------+
| actor_id | first_name | last_name |
+----------+------------+-----------+
| 1 | Test | 1 |
| 201 | Test | 201 |
| 235 | List | Tom |
| 236 | List | Tom |
| 237 | Abc | Def |
+----------+------------+-----------+
5 rows in set (0.00 sec)
mysql> rollback;
Query OK, 0 rows affected (0.00 sec)
host2:
mysql> select * from actor ;
+----------+------------+-----------+
| actor_id | first_name | last_name |
+----------+------------+-----------+
| 1 | Test | 1 |
| 201 | Test | 201 |
| 235 | List | Tom |
| 236 | List | Tom |
| 237 | Abc | Def |
+----------+------------+-----------+
host1:
mysql> select * from actor;
+----------+------------+-----------+
| actor_id | first_name | last_name |
+----------+------------+-----------+
| 1 | Test | 1 |
| 201 | Test | 201 |
| 235 | List | Tom |
| 236 | List | Tom |
| 237 | Abc | Def |
+----------+------------+-----------+
5 rows in set (0.00 sec)
mysql> start transaction;
Query OK, 0 rows affected (0.00 sec)
mysql> select * from actor where actor_id = 301;
Empty set (0.00 sec)
host1:
mysql> start transaction;
Query OK, 0 rows affected (0.00 sec)
mysql> insert into actor(actor_id) values (301);
Query OK, 1 row affected (0.00 sec)
mysql> select * from actor where actor_id = 301;
+----------+------------+-----------+
| actor_id | first_name | last_name |
+----------+------------+-----------+
| 301 | NULL | NULL |
+----------+------------+-----------+
1 row in set (0.00 sec)
mysql> savepoint test;
Query OK, 0 rows affected (0.00 sec)
mysql> insert into actor(actor_id) values (302);
Query OK, 1 row affected (0.00 sec)
mysql> select * from actor;
+----------+------------+-----------+
| actor_id | first_name | last_name |
+----------+------------+-----------+
| 1 | Test | 1 |
| 201 | Test | 201 |
| 235 | List | Tom |
| 236 | List | Tom |
| 237 | Abc | Def |
| 301 | NULL | NULL |
| 302 | NULL | NULL |
+----------+------------+-----------+
7 rows in set (0.00 sec)
mysql> rollback to savepoint test;
Query OK, 0 rows affected (0.00 sec)
mysql> select * from actor;
+----------+------------+-----------+
| actor_id | first_name | last_name |
+----------+------------+-----------+
| 1 | Test | 1 |
| 201 | Test | 201 |
| 235 | List | Tom |
| 236 | List | Tom |
| 237 | Abc | Def |
| 301 | NULL | NULL |
+----------+------------+-----------+
6 rows in set (0.00 sec)
mysql> commit;
Query OK, 0 rows affected (0.00 sec)