Mysql互為主從問題--日志同步數(shù)據(jù)不同步

我搭建的是mysql互為主從 復(fù)制

兩臺(tái)機(jī)器的mysql環(huán)境完全相同

第一部分測(cè)試：

B為master A為slave的同步測(cè)試

在B上創(chuàng)建表lian，并插入數(shù)據(jù)

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，查看以上操作是否記錄了日志：

cat mysql-bin.000002

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

現(xiàn)在查看slave-A的relay日志，發(fā)現(xiàn)日志已經(jīng)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上看一下數(shù)據(jù)庫是不是存在lian這個(gè)表：

mysql> use test;

Database changed

mysql> show tables;

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

| Tables_in_test |

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

| aniya |

|lian |

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

2 rows in set (0.00 sec)

現(xiàn)在說明數(shù)據(jù)B A 主 從 同步成功

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

第二部分測(cè)試：

A為master B為slave的同步測(cè)試

在A上創(chuàng)建表From246，并插入數(shù)據(jù)

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,證明上述操作成功

[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的日志狀態(tài)

[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日志狀態(tài)，可以看到日志已經(jīng)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*/;

但是數(shù)據(jù)卻沒有插入到relay-B的數(shù)據(jù)庫

mysql> show tables;

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

| Tables_in_test |

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

| lian |

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

1 row in set (0.00 sec)

當(dāng)我刪除master-A上的表時(shí)，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

這是什么奇怪問題 ？？

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

問題排查：

首先在Master-A上用

show processlist; 查看下進(jìn)程是否Sleep太多。發(fā)現(xiàn)很正常

show master status; 也正常

再跑到Slave上查看 show slave status; 也正常

當(dāng)我手動(dòng)從A導(dǎo)入B數(shù)據(jù)時(shí)，發(fā)現(xiàn)一個(gè)問題：

mysql> load table From246 from master;

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

懷疑：難道是因?yàn)樽址膯栴}導(dǎo)致AB主從復(fù)制失敗 ？

通過show character set 命令查看到

master-A有g(shù)bk字符集而slave-B沒有

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)

那現(xiàn)在應(yīng)該是在啟動(dòng)mysql的時(shí)候統(tǒng)一他們的字符集

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上從A導(dǎo)入數(shù)據(jù)：

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)

現(xiàn)在字符集的問題解決了

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

現(xiàn)在手動(dòng)啟動(dòng)一下“將日志應(yīng)用于數(shù)據(jù)庫”的線程：SLAVE start SQL_THREAD

和“把master段的日志寫到本地”的線程：SLAVE start IO_THREAD

發(fā)現(xiàn)同步數(shù)據(jù)還是失敗，那說明不是線程的問題

如果發(fā)現(xiàn) Seconds_Behind_Master 為 (null)

解決：

stop slave;

set global sql_slave_skip_counter =1 ;

start slave;

之后Slave會(huì)和Master去同步 主要看Seconds_Behind_Master是否為0，直到為0時(shí)就已經(jīng)同步了。。

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

slave B機(jī)器上master.info信息，與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

從以上可以看到是同步的

到目前為止我都沒發(fā)現(xiàn)到底是什么問題導(dǎo)致“日志同步數(shù)據(jù)不同步” 很是納悶

向高手們請(qǐng)教！！！！

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2011-09-26 17:40

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