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 query thread_id=5 exec_time=0 error_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 query thread_id=5 exec_time=0 error_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 query thread_id=5 exec_time=0 error_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 query thread_id=5 exec_time=0 error_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 a246nt@stdtestdrop table aniyansd@stdtestdrop table liannv?@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
作者“anljf的专栏”
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