RR区间锁 不是唯一索引,即使区间内没值,也锁

+---------

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

-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

----+
| Table   | Create Table                                                                                                                                                                              

            |
+---------

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

-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

----+
| SmsTest | 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=45209 DEFAULT CHARSET=utf8 COMMENT='短信发送成功记录表'                                  |
+---------

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

-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

----+
1 row in set (0.06 sec)

mysql> insert into SmsTest select sn,sn,channelType,status from SmsRecord limit 13;
Query OK, 13 rows affected (0.02 sec)
Records: 13  Duplicates: 0  Warnings: 0

mysql> create index SmsTest_idx1 on SmsTest(phoneNo);
Query OK, 0 rows affected (0.15 sec)
Records: 0  Duplicates: 0  Warnings: 0

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 |           2 |      1 |
|    11 |      11 |           2 |      1 |
|    12 |      12 |           2 |      1 |
|    13 |      13 |           2 |      1 |
| 45209 |      16 |           1 |      1 |
| 45210 |      17 |           1 |      1 |
| 45211 |      18 |           1 |      1 |
| 45212 |      19 |           1 |      1 |
| 45213 |      20 |           1 |      1 |
+-------+---------+-------------+--------+
18 rows in set (0.00 sec)

Session 1:

mysql>  select @@tx_isolation;
+-----------------+
| @@tx_isolation  |
+-----------------+
| REPEATABLE-READ |
+-----------------+
1 row in set (0.00 sec)

mysql> start transaction;
Query OK, 0 rows affected (0.00 sec)

mysql> select * from SmsTest  where phoneNo between 10 and 20 for update;
+-------+---------+-------------+--------+
| sn    | phoneNo | channelType | status |
+-------+---------+-------------+--------+
|    10 |      10 |           2 |      1 |
|    11 |      11 |           2 |      1 |
|    12 |      12 |           2 |      1 |
|    13 |      13 |           2 |      1 |
| 45209 |      16 |           1 |      1 |
| 45210 |      17 |           1 |      1 |
| 45211 |      18 |           1 |      1 |
| 45212 |      19 |           1 |      1 |
| 45213 |      20 |           1 |      1 |
+-------+---------+-------------+--------+
9 rows in set (0.02 sec)

Session 2:

mysql>  insert into zjzc.SmsTest(PhoneNo,channelType,status)  values(8,1,1);
Query OK, 1 row affected (0.01 sec)

mysql>  insert into zjzc.SmsTest(PhoneNo,channelType,status)  values(9,1,1);  --hang

mysql>  insert into zjzc.SmsTest(PhoneNo,channelType,status)  values(10,1,1);--hang

mysql>  insert into zjzc.SmsTest(PhoneNo,channelType,status)  values(11,1,1); --hang

mysql>  insert into zjzc.SmsTest(PhoneNo,channelType,status)  values(12,1,1); --hang
mysql>  insert into zjzc.SmsTest(PhoneNo,channelType,status)  values(14,1,1); --hang

mysql>  insert into zjzc.SmsTest(PhoneNo,channelType,status)  values(15,1,1); --hang

RR区间锁 不是唯一索引,即使区间内没值,也锁