mysql 日志同步 数据不同步_Mysql互为主从问题--日志同步数据不同步
Mysql互為主從問題--日志同步數據不同步
我搭建的是mysql互為主從 復制
兩臺機器的mysql環境完全相同
第一部分測試：
B為master A為slave的同步測試
在B上創建表lian，并插入數據
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')
現在查看slave-A的relay日志，發現日志已經同步了
[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上看一下數據庫是不是存在lian這個表：
mysql> use test;
Database changed
mysql> show tables;
+----------------+
| Tables_in_test |
+----------------+
| aniya |
|lian |
+----------------+
2 rows in set (0.00 sec)
現在說明數據B A 主 從 同步成功
---------------------------------------------------------------------------
第二部分測試：
A為master B為slave的同步測試
在A上創建表From246，并插入數據
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
[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，可以看到日志已經同步
[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*/;
但是數據卻沒有插入到relay-B的數據庫
mysql> show tables;
+----------------+
| Tables_in_test |
+----------------+
| lian |
+----------------+
1 row in set (0.00 sec)
當我刪除master-A上的表時，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; 查看下進程是否Sleep太多。發現很正常
show master status; 也正常
再跑到Slave上查看 show slave status; 也正常
當我手動從A導入B數據時，發現一個問題：
mysql> load table From246 from master;
ERROR 1115 (42000): Unknown character set: 'gbk'
懷疑：難道是因為字符串的問題導致AB主從復制失敗 ？
通過show character set 命令查看到
master-A有gbk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)
那現在應該是在啟動mysql的時候統一他們的字符集
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導入數據：
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)
現在字符集的問題解決了
---------------------------------------------------------------
現在手動啟動一下“將日志應用于數據庫”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
發現同步數據還是失敗，那說明不是線程的問題
如果發現 Seconds_Behind_Master 為 (null)
解決：
stop slave;
set global sql_slave_skip_counter =1 ;
start slave;
之后Slave會和Master去同步 主要看Seconds_Behind_Master是否為0，直到為0時就已經同步了。。
-----------------------------------
slave B機器上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現到底是什么問題導致“日志同步數據不同步” 很是納悶
向高手們請教！！！！
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2011-09-26 17:40
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