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:忽略錯誤後,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,後面的數字可變
set global sql_slave_skip_counter =1;
start slave;
之後再用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:該處是鎖定爲只讀狀態,語句不區分大小寫
[b]記錄當前的位置和bin日誌,恢復的時候使用[/b]
SHOW MASTER STATUS;
mysql> SHOW MASTER STATUS;
+------------------+----------+--------------+------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000001 | 107 | newdatabase | |
+------------------+----------+--------------+------------------+
1 row in set (0.00 sec)
UNLOCK TABLES; 釋放鎖操作,使其可正常運行
2.進行數據備份
#把數據備份到mysql.bak.sql文件
#mysqldump -uroot -p -hlocalhost > mysql.bak.sql
這裏注意一點: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
# scp mysql.bak.sql [email protected]:/tmp/
5.停止從庫的狀態
mysql> stop slave;
6.然後到從庫執行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信息裏的| 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.重新開啓從同步
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
好了,同步完成啦。
主參考鏈接:https://www.digitalocean.com/community/tutorials/how-to-set-up-master-slave-replication-in-mysql
http://www.cnblogs.com/feichexia/p/MysqlDataBackup.html
http://www.cnblogs.com/shawnloong/archive/2013/02/07/2908911.html
http://wangwei007.blog.51cto.com/68019/965575
MySql主從配置
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