Mysql互为主从问题--日志同步数据不同步

我搭建的是mysql互为主从 复制

两台机器的mysql环境完全相同

第一部分测试：

B为master A为slave的同步测试

在B上创建表lian，并插入数据

mysql> create table lian (a int,b char(10));

mysql> insert into lian (a,b)values(22,'hahah');

mysql> show tables;

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

| Tables_in_test |

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

| lian |

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

mysql> select * from lian;

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

| a | b |

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

| 22 | hahah |

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

查看一下master-B的binlog日志，查看以上操作是否记录了日志：

cat mysql-bin.000002

.?Nh?@stdtestcreate table lian (a int,b char(10))??Nl>@stdtestinsert into lian (a,b)values(22,'hahah')

现在查看slave-A的relay日志，发现日志已经同步了

[root@XKWB5510 var]# cat XKWB5510-relay-bin.000003

.?Nh?@stdtestcreate table lian (a int,b char(10))??Nl>@stdtestinsert into lian (a,b)values(22,'hahah')

再在slave-A上看一下数据库是不是存在lian这个表：

mysql> use test;

Database changed

mysql> show tables;

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

| Tables_in_test |

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

| aniya |

|lian |

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

2 rows in set (0.00 sec)

现在说明数据B A 主 从 同步成功

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

第二部分测试：

A为master B为slave的同步测试

在A上创建表From246，并插入数据

mysql> use test;

mysql> show tables;

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

| Tables_in_test |

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

| A246 |

| aniya |

| lian |

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

3 rows in set (0.00 sec)

mysql> create table From246(Name varchar(255),Sex varchar(255),Age int(10));

mysql> show tables;

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

| Tables_in_test |

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

| A246 |

| From246 |

| aniya |

| lian |

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

4 rows in set (0.00 sec)

mysql> insert into From246 (Name,Sex,Age)values('Zhaoyj','Girl',24);

mysql> select * from From246;

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

| Name | Sex | Age |

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

| Zhaoyj | Girl | 24 |

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

1 row in set (0.00 sec)

查看master-A的binlog日志,证明上述操作成功

[root@XKWB5510 var]# tail -1 mysql-bin.000002

testcreate table From246(Name varchar(255),Sex varchar(255),Age int(10))?N?R@stdtestinsert into From246 (Name,Sex,Age)values('Zhaoyj','Girl',24)

查看master-A的日志状态

[root@XKWB5510 var]# /usr/local/mysql/bin/mysqlbinlog mysql-bin.000003 |tail -15

/*!*/;

# at 702

#110926 14:01:51 server id 1 end_log_pos 838 Querythread_id=5exec_time=0error_code=0

SET TIMESTAMP=1317016911/*!*/;

create table From246(Name varchar(255),Sex varchar(255),Age int(10))

/*!*/;

# at 838

#110926 14:02:05 server id 1 end_log_pos 966 Querythread_id=5exec_time=0error_code=0

SET TIMESTAMP=1317016925/*!*/;

insert into From246 (Name,Sex,Age)values('Zhaoyj','Girl',24)

/*!*/;

DELIMITER ;

# End of log file

ROLLBACK /* added by mysqlbinlog */;

/*!50003 SET COMPLETION_TYPE=@OLD_COMPLETION_TYPE*/;

查看relay-B的日志，同步日志成功

testcreate table From246(Name varchar(255),Sex varchar(255),Age int(10))?N?R@stdtestinsert into From246 (Name,Sex,Age)values('Zhaoyj','Girl',24)[root@XKWB5705 var]

查看relay-B日志状态，可以看到日志已经同步

[root@XKWB5705 var]# /usr/local/mysql/bin/mysqlbinlog XKWB5705-relay-bin.000005|tail -13

/usr/local/mysql/bin/mysqlbinlog: Character set '#28' is not a compiled character set and is not specified in the '/usr/local/mysql/share/mysql/charsets/Index.xml' file

#110926 14:01:51 server id 1 end_log_pos 838 Querythread_id=5exec_time=0error_code=0

SET TIMESTAMP=1317016911/*!*/;

create table From246(Name varchar(255),Sex varchar(255),Age int(10))

/*!*/;

# at 853

#110926 14:02:05 server id 1 end_log_pos 966 Querythread_id=5exec_time=0error_code=0

SET TIMESTAMP=1317016925/*!*/;

insert into From246 (Name,Sex,Age)values('Zhaoyj','Girl',24)

/*!*/;

DELIMITER ;

# End of log file

ROLLBACK /* added by mysqlbinlog */;

/*!50003 SET COMPLETION_TYPE=@OLD_COMPLETION_TYPE*/;

但是数据却没有插入到relay-B的数据库

mysql> show tables;

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

| Tables_in_test |

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

| lian |

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

1 row in set (0.00 sec)

当我删除master-A上的表时，relay-B日志也同步了

[root@XKWB5705 var]# tail -4 XKWB5705-relay-bin.000005

??NS?@stdtestdrop table A246??NT@stdtestdrop table aniya??NSd@stdtestdrop table lian??NV?@stdtestdrop table From246

这是什么奇怪问题 ？？

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

问题排查：

首先在Master-A上用

show processlist; 查看下进程是否Sleep太多。发现很正常

show master status; 也正常

再跑到Slave上查看 show slave status; 也正常

当我手动从A导入B数据时，发现一个问题：

mysql> load table From246 from master;

ERROR 1115 (42000): Unknown character set: 'gbk'

怀疑：难道是因为字符串的问题导致AB主从复制失败 ？

通过show character set 命令查看到

master-A有gbk字符集而slave-B没有

mysql> show character set;

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

| Charset | Description | Default collation | Maxlen |

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

| dec8 | DEC West European | dec8_swedish_ci | 1 |

| cp850 | DOS West European | cp850_general_ci | 1 |

| hp8 | HP West European | hp8_english_ci | 1 |

| koi8r | KOI8-R Relcom Russian | koi8r_general_ci | 1 |

| latin1 | cp1252 West European | latin1_swedish_ci | 1 |

| latin2 | ISO 8859-2 Central European | latin2_general_ci | 1 |

| swe7 | 7bit Swedish | swe7_swedish_ci | 1 |

| ascii | US ASCII | ascii_general_ci | 1 |

| hebrew | ISO 8859-8 Hebrew | hebrew_general_ci | 1 |

| koi8u | KOI8-U Ukrainian | koi8u_general_ci | 1 |

| greek | ISO 8859-7 Greek | greek_general_ci | 1 |

| cp1250 | Windows Central European | cp1250_general_ci | 1 |

| gbk | GBK Simplified Chinese | gbk_chinese_ci | 2 |

| latin5 | ISO 8859-9 Turkish | latin5_turkish_ci | 1 |

| armscii8 | ARMSCII-8 Armenian | armscii8_general_ci | 1 |

| utf8 | UTF-8 Unicode | utf8_general_ci | 3 |

| cp866 | DOS Russian | cp866_general_ci | 1 |

| keybcs2 | DOS Kamenicky Czech-Slovak | keybcs2_general_ci | 1 |

| macce | Mac Central European | macce_general_ci | 1 |

| macroman | Mac West European | macroman_general_ci | 1 |

| cp852 | DOS Central European | cp852_general_ci | 1 |

| latin7 | ISO 8859-13 Baltic | latin7_general_ci | 1 |

| cp1251 | Windows Cyrillic | cp1251_general_ci | 1 |

| cp1256 | Windows Arabic | cp1256_general_ci | 1 |

| cp1257 | Windows Baltic | cp1257_general_ci | 1 |

| binary | Binary pseudo charset | binary | 1 |

| geostd8 | GEOSTD8 Georgian | geostd8_general_ci | 1 |

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

27 rows in set (0.00 sec)

那现在应该是在启动mysql的时候统一他们的字符集

master-A: [root@XKWB5510 var]# /usr/local/mysql/bin/mysqld_safe --default-character-set=latin1 &

slave-B : [root@XKWB5705 var]# /usr/local/mysql/bin/mysqld_safe --default-character-set=latin1 &

再次在B上从A导入数据：

mysql> show tables;

Empty set (0.00 sec)

mysql> load table From246 from master;

Query OK, 0 rows affected (0.01 sec)

mysql> show tables;

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

| Tables_in_test |

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

| From246 |

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

1 row in set (0.00 sec)

现在字符集的问题解决了

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

现在手动启动一下“将日志应用于数据库”的线程：SLAVE start SQL_THREAD

和“把master段的日志写到本地”的线程：SLAVE start IO_THREAD

发现同步数据还是失败，那说明不是线程的问题

如果发现 Seconds_Behind_Master 为 (null)

解决：

stop slave;

set global sql_slave_skip_counter =1 ;

start slave;

之后Slave会和Master去同步 主要看Seconds_Behind_Master是否为0，直到为0时就已经同步了。。

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

slave B机器上master.info信息，与master A上的信息是否是同步的

mater A：

mysql> show master status\G;

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

File: mysql-bin.000004

Position: 808

Binlog_Do_DB: test

Binlog_Ignore_DB: mysql

1 row in set (0.00 sec)

slave B：

[root@XKWB5705 var]# cat master.info

15

mysql-bin.000004

808

211.100.97.246

repl2

123456

3306

60

0

从以上可以看到是同步的

到目前为止我都没发现到底是什么问题导致“日志同步数据不同步” 很是纳闷

向高手们请教！！！！

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2011-09-26 17:40

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