The locks are normally next-key locks that also block inserts into the “gap” immediately before the record. 

mysql> select @@tx_isolation;

+-----------------+

| @@tx_isolation  |

+-----------------+

| REPEATABLE-READ |

+-----------------+

1 row in set (0.00 sec)

第一种情况  更新列没有索引:

CREATE TABLE `SmsTest` (

  `sn` int(11) NOT NULL AUTO_INCREMENT COMMENT '自增编号',

  `phoneNo` int(16) NOT NULL,

  `channelType` int(11) DEFAULT NULL COMMENT '通道识别',

  `status` tinyint(4) NOT NULL COMMENT '短信转态,1.发送成功,2.发送失败,3.发送异常',

  PRIMARY KEY (`sn`)

) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8 COMMENT='短信发送成功记录表';  

mysql> show create table SmsTest\G;

*************************** 1. row ***************************

       Table: SmsTest

Create Table: CREATE TABLE `SmsTest` (

  `sn` int(11) NOT NULL AUTO_INCREMENT COMMENT '自增编号',

  `phoneNo` int(16) NOT NULL,

  `channelType` int(11) DEFAULT NULL COMMENT '通道识别',

  `status` tinyint(4) NOT NULL COMMENT '短信转态,1.发送成功,2.发送失败,3.发送异常',

  PRIMARY KEY (`sn`)

) ENGINE=InnoDB AUTO_INCREMENT=22 DEFAULT CHARSET=utf8 COMMENT='短信发送成功记录表'

1 row in set (0.00 sec)

ERROR:

No query specified

mysql> show index from SmsTest;

+---------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+

| Table   | Non_unique | Key_name | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | Index_comment |

+---------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+

| SmsTest |          0 | PRIMARY  |            1 | sn          | A         |          16 |     NULL | NULL   |      | BTREE      |         |               |

+---------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+

1 row in set (0.00 sec)

mysql> select * from  SmsTest;

+----+---------+-------------+--------+

| sn | phoneNo | channelType | status |

+----+---------+-------------+--------+

|  1 |       1 |           2 |      1 |

|  2 |       2 |           2 |      1 |

|  3 |       3 |           2 |      1 |

|  4 |       4 |           2 |      1 |

|  5 |       5 |           2 |      1 |

|  6 |       6 |           2 |      1 |

|  7 |       7 |           2 |      1 |

|  8 |       8 |           2 |      1 |

|  9 |       9 |           2 |      1 |

| 10 |      10 |           1 |      1 |

| 16 |      16 |          45 |     56 |

| 17 |      17 |           2 |      1 |

| 18 |      18 |           1 |      1 |

| 19 |      19 |           1 |      1 |

| 20 |      20 |           2 |      1 |

| 21 |      10 |           1 |      1 |

+----+---------+-------------+--------+

16 rows in set (0.00 sec)

/*********第一种情况 更新列没有索引:

Session 1:

mysql> start transaction;

Query OK, 0 rows affected (0.00 sec)

mysql> select * from SmsTest where phoneNo=16 for update;

+----+---------+-------------+--------+

| sn | phoneNo | channelType | status |

+----+---------+-------------+--------+

| 16 |      16 |          45 |     56 |

+----+---------+-------------+--------+

1 row in set (0.00 sec)

 mysql[192.168.11.187]  processid[3] root@localhost in db[zjzc] hold  transaction time 55

You have new mail in /var/spool/mail/root

进程ID为3

Session 2:

mysql> start transaction;

Query OK, 0 rows affected (0.00 sec)

mysql> insert into SmsTest values(11,11,1,1);  ##堵塞

2016-11-25 10:03:19,152,3,root,localhost,zjzc

 mysql[192.168.11.187]  processid[3] root@localhost in db[zjzc] hold  transaction time 152

112072530,26,insert into SmsTest values(11,11,1,1),112072529,3,

 mysql[192.168.11.187]   blocking_thread[3] blocking_query[]  blocking waiting_thread[26]'s insert into SmsTest values(11,11,1,1)

You have new mail in /var/spool/mail/root

mysql> insert into zjzc.SmsTest values(11,1,1,1);

mysql> insert into zjzc.SmsTest values(110,110,1,1); ###堵塞

 mysql[192.168.11.187]   blocking_thread[3] blocking_query[]  blocking waiting_thread[34]'s insert into zjzc.SmsTest values(110,110,1,1)

mysql> insert into zjzc.SmsTest values(200,110,1,1);

112072532,34,insert into zjzc.SmsTest values(220,220,1,1),112072529,3,

 mysql[192.168.11.187]   blocking_thread[3] blocking_query[]  blocking waiting_thread[34]'s insert into zjzc.SmsTest values(220,220,1,1)

Vsftp:/root# mysql -uroot -p1234567 -e"show processlist"

Warning: Using a password on the command line interface can be insecure.

+----+------+-----------+------+---------+------+--------+----------------------------------------------+

| Id | User | Host      | db   | Command | Time | State  | Info                                         |

+----+------+-----------+------+---------+------+--------+----------------------------------------------+

|  3 | root | localhost | zjzc | Sleep   |  469 |        | NULL                                         |

| 34 | root | localhost | zjzc | Query   |    7 | update | insert into zjzc.SmsTest values(220,220,1,1) |

| 41 | root | localhost | NULL | Query   |    0 | init   | show processlist                             |

+----+------+-----------+------+---------+------+--------+----------------------------------------------+

更新列没有索引,此时锁全表

/*********第一种情况 更新列有索引,但是非唯一索引

mysql> show create table  zjzc.SmsTest\G;

*************************** 1. row ***************************

       Table: SmsTest

Create Table: CREATE TABLE `SmsTest` (

  `sn` int(11) NOT NULL AUTO_INCREMENT COMMENT '自增编号',

  `phoneNo` int(16) NOT NULL,

  `channelType` int(11) DEFAULT NULL COMMENT '通道识别',

  `status` tinyint(4) NOT NULL COMMENT '短信转态,1.发送成功,2.发送失败,3.发送异常',

  PRIMARY KEY (`sn`)

) ENGINE=InnoDB AUTO_INCREMENT=22 DEFAULT CHARSET=utf8 COMMENT='短信发送成功记录表'

1 row in set (0.00 sec)

ERROR:

No query specified

mysql> show index from SmsTest;

+---------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+

| Table   | Non_unique | Key_name | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | Index_comment |

+---------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+

| SmsTest |          0 | PRIMARY  |            1 | sn          | A         |          15 |     NULL | NULL   |      | BTREE      |         |               |

+---------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+

1 row in set (0.00 sec)

创建索引,在phoneNo 列上

mysql> start transaction;

Query OK, 0 rows affected (0.00 sec)

mysql> select * from SmsTest where phoneNo=16 for update;

+----+---------+-------------+--------+

| sn | phoneNo | channelType | status |

+----+---------+-------------+--------+

| 16 |      16 |          45 |     56 |

+----+---------+-------------+--------+

1 row in set (0.00 sec)

Session 2:

mysql> insert into SmsTest values(99,9,1,1);

Query OK, 1 row affected (0.00 sec)

mysql> insert into SmsTest values(99,10,1,1); ##堵塞

mysql> insert into SmsTest values(11,11,1,1); ##堵塞

ERROR 1205 (HY000): Lock wait timeout exceeded; try restarting transaction

mysql> 

 mysql[192.168.11.187]  processid[1] root@localhost in db[zjzc] hold  transaction time 40

112074074,25,insert into SmsTest values(11,11,1,1),112074073,1,

 mysql[192.168.11.187]   blocking_thread[1] blocking_query[]  blocking waiting_thread[25]'s insert into SmsTest values(11,11,1,1)

mysql> insert into SmsTest values(12,12,1,1);

ERROR 1205 (HY000): Lock wait timeout exceeded; try restarting transaction

mysql> insert into SmsTest values(13,13,1,1);

ERROR 1205 (HY000): Lock wait timeout exceeded; try restarting transaction

mysql> insert into SmsTest values(14,14,1,1);

ERROR 1205 (HY000): Lock wait timeout exceeded; try restarting transaction

mysql> insert into SmsTest values(14,14,1,1);

ERROR 1205 (HY000): Lock wait timeout exceeded; try restarting transaction

mysql> insert into SmsTest values(15,15,1,1);

ERROR 1205 (HY000): Lock wait timeout exceeded; try restarting transaction

mysql> insert into SmsTest values(16,16,1,1);

ERROR 1205 (HY000): Lock wait timeout exceeded; try restarting transaction

mysql> insert into SmsTest values(17,17,1,1);

ERROR 1062 (23000): Duplicate entry '17' for key 'PRIMARY'

mysql> insert into SmsTest values(99,17,1,1);

ERROR 1062 (23000): Duplicate entry '99' for key 'PRIMARY'

mysql> insert into SmsTest values(999,17,1,1);

Query OK, 1 row affected (0.00 sec)

更新列上有唯一索引 ,锁住的区间为【10,16】

/*********第一种情况 更新列有索引,且是唯一索引

mysql> create unique index SmsTest_idx1 on SmsTest(phoneNo);

Query OK, 0 rows affected (0.02 sec)

Records: 0  Duplicates: 0  Warnings: 0

mysql> show create table SmsTest\G;

*************************** 1. row ***************************

       Table: SmsTest

Create Table: CREATE TABLE `SmsTest` (

  `sn` int(11) NOT NULL AUTO_INCREMENT COMMENT '自增编号',

  `phoneNo` int(16) NOT NULL,

  `channelType` int(11) DEFAULT NULL COMMENT '通道识别',

  `status` tinyint(4) NOT NULL COMMENT '短信转态,1.发送成功,2.发送失败,3.发送异常',

  PRIMARY KEY (`sn`),

  UNIQUE KEY `SmsTest_idx1` (`phoneNo`)

) ENGINE=InnoDB AUTO_INCREMENT=21 DEFAULT CHARSET=utf8 COMMENT='短信发送成功记录表'

1 row in set (0.00 sec)

ERROR:

No query specified

Session 1:

mysql> start transaction;

Query OK, 0 rows affected (0.00 sec)

mysql> select * from SmsTest where phoneNo=16 for update;

+----+---------+-------------+--------+

| sn | phoneNo | channelType | status |

+----+---------+-------------+--------+

| 16 |      16 |          45 |     56 |

+----+---------+-------------+--------+

1 row in set (0.00 sec)

Session 2:

mysql> use zjzc;

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> insert into SmsTest values(11,11,1,1);

Query OK, 1 row affected (0.00 sec)

mysql> rollback;

Query OK, 0 rows affected (0.00 sec)

mysql> insert into SmsTest values(12,12,1,1);

Query OK, 1 row affected (0.00 sec)

mysql> rollback;

Query OK, 0 rows affected (0.00 sec)

mysql> insert into SmsTest values(13,13,1,1);

Query OK, 1 row affected (0.00 sec)

mysql> rollback;

Query OK, 0 rows affected (0.00 sec)

mysql> insert into SmsTest values(14,14,1,1);

Query OK, 1 row affected (0.00 sec)

mysql> rollback;

Query OK, 0 rows affected (0.00 sec)

mysql> insert into SmsTest values(15,15,1,1);

Query OK, 1 row affected (0.00 sec)

mysql> rollback;

Query OK, 0 rows affected (0.00 sec)

mysql> insert into SmsTest values(16,16,1,1);  ##堵塞

ERROR 1205 (HY000): Lock wait timeout exceeded; try restarting transaction

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