今天發現Mysql的主從數據庫沒有同步
先上Master庫：
mysql>show processlist; 查看下進程是否Sleep太多。發現很正常。
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
可見是Slave不同步
下面介紹兩種解決方法：
方法一：忽略錯誤后，繼續同步
該方法適用於主從庫數據相差不大，或者要求數據可以不完全統一的情況，數據要求不嚴格的情況
解決：
stop slave;
#表示跳過一步錯誤，后面的數字可變
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，現在主從同步狀態正常了。。。
方式二：重新做主從，完全同步
該方法適用於主從庫數據相差較大，或者要求數據完全統一的情況
解決步驟如下：
1.先進入主庫，進行鎖表，防止數據寫入
使用命令：
mysql> flush tables with read lock;
注意：該處是鎖定為只讀狀態，語句不區分大小寫
2.進行數據備份
#把數據備份到mysql.bak.sql文件
[root@server01 mysql]#mysqldump -uroot -p -hlocalhost > mysql.bak.sql
這里注意一點：數據庫備份一定要定期進行，可以用shell腳本或者python腳本，都比較方便，確保數據萬無一失
3.查看master 狀態
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備份文件傳到從庫機器，進行數據恢復
#使用scp命令
[root@server01 mysql]# scp mysql.bak.sql root@192.168.128.101:/tmp/
5.停止從庫的狀態
mysql> stop slave;
6.然后到從庫執行mysql命令，導入數據備份
mysql> source /tmp/mysql.bak.sql
7.設置從庫同步，注意該處的同步點，就是主庫show master status信息里的| File| Position兩項
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.重新開啟從同步
mysql> start slave;
9.查看同步狀態
mysql> show slave status\G 查看：
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
10、回到主庫並執行：UNLOCK TABLES;
好了，同步完成啦。
======================================================================
-- ===================================方法一：跳過錯誤數===================================
show slave status;
stop slave;
set GLOBAL SQL_SLAVE_SKIP_COUNTER=1000;
start slave;
-- ===================================方法二：重新設置主從===================================
-- master 執行獲取 master_log_file 和 master_log_pos
show master status;
-- slave 執行
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%';