解决Mysql的主从数据库没有同步的两种方法
今天发现Mysql的主从数据库没有同步
先上Master库：
mysql>show processlist; 查看下进程是否Sleep太多。发现很正常。
show master status; 也正常。
mysql> show master status;
+-------------------+----------+--------------+-------------------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+-------------------+----------+--------------+-------------------------------+
| mysqld-bin.000001 | 3260 | | mysql,test,information_schema |
+-------------------+----------+--------------+-------------------------------+
1 row in set (0.00 sec)
再到Slave上查看
mysql> show slave status\G
Slave_IO_Running: Yes
Slave_SQL_Running: No
可见是Slave不同步
下面介绍两种解决方法：
方法一：忽略错误后，继续同步
该方法适用于主从库数据相差不大，或者要求数据可以不完全统一的情况，数据要求不严格的情况
解决：
stop slave;
#表示跳过一步错误，后面的数字可变
set global sql_slave_skip_counter =1;
start slave;
之后再用mysql> show slave status\G 查看：
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
ok，现在主从同步状态正常了。。。
方式二：重新做主从，完全同步
该方法适用于主从库数据相差较大，或者要求数据完全统一的情况
解决步骤如下：
1.先进入主库，进行锁表，防止数据写入
使用命令：
mysql> flush tables with read lock;
注意：该处是锁定为只读状态，语句不区分大小写
2.进行数据备份
#把数据备份到mysql.bak.sql文件
[root@server01 mysql]#mysqldump -uroot -p -hlocalhost > mysql.bak.sql
这里注意一点：数据库备份一定要定期进行，可以用shell脚本或者python脚本，都比较方便，确保数据万无一失
3.查看master 状态
mysql> show master status;
+-------------------+----------+--------------+-------------------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+-------------------+----------+--------------+-------------------------------+
| mysqld-bin.000001 | 3260 | | mysql,test,information_schema |
+-------------------+----------+--------------+-------------------------------+
1 row in set (0.00 sec)
4.把mysql备份文件传到从库机器，进行数据恢复
#使用scp命令
[root@server01 mysql]# scp mysql.bak.sql root@192.168.128.101:/tmp/
5.停止从库的状态
mysql> stop slave;
6.然后到从库执行mysql命令，导入数据备份
mysql> source /tmp/mysql.bak.sql
7.设置从库同步，注意该处的同步点，就是主库show master status信息里的| File| Position两项
change master to master_host = '192.168.128.100', master_user = 'rsync', master_port=3306, master_password='', master_log_file = 'mysqld-bin.000001', master_log_pos=3260;
8.重新开启从同步
mysql> start slave;
9.查看同步状态
mysql> show slave status\G 查看：
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
10、回到主库并执行：UNLOCK TABLES;
好了，同步完成啦。
======================================================================
-- ===================================方法一：跳过错误数===================================
show slave status;
stop slave;
set GLOBAL SQL_SLAVE_SKIP_COUNTER=1000;
start slave;
-- ===================================方法二：重新设置主从===================================
-- master 执行获取 master_log_file 和 master_log_pos
show master status;
-- slave 执行
stop slave;
change master to master_host="129.204.194.53", master_user="root", master_password="root", master_port=3306, master_log_file="mysql-bin.000018", master_log_pos=244160466;
start slave;
======================================
查看server_id、server_uuid
show variables like 'server_id';
show variables like 'server_uuid';
======================================
SET GLOBAL log_bin_trust_function_creators =0;
stop slave;
change master to master_host="129.204.194.53", master_user="root", master_password="SJHT...999)))", master_port=3306, master_log_file="mysql-bin.000082", master_log_pos=122770;
start slave;
CHANGE MASTER TO MASTER_LOG_FILE='mysql-bin.000081',MASTER_LOG_POS=154;
change master to master_log_file='mysql-bin.000081',master_log_pos=10034;
show variables like 'server_id';
show slave status;
show variables like 'server_uuid';
stop slave;
reset slave;
start slave;
stop slave;
set GLOBAL SQL_SLAVE_SKIP_COUNTER=1;
start slave;
show slave status;
show variables like 'log_bin_trust_function_creators';
SET GLOBAL log_bin_trust_function_creators = 0;
CREATE FUNCTION `getChildLst`(rootId VARCHAR(32))
RETURNS varchar(1024)
READS SQL DATA
BEGIN
DECLARE sTemp VARCHAR(1024);
DECLARE sTempChd VARCHAR(1024);
SET sTemp = '$';
SET sTempChd =cast(rootId as CHAR);
WHILE sTempChd is not null DO
SET sTemp = concat(sTemp,',',sTempChd);
SELECT group_concat(id) INTO sTempChd FROM sys_org where FIND_IN_SET(parent_id,sTempChd)>0;
END WHILE;
RETURN sTemp;
END
show variables like '%relay%';
