mysql主从处理

1.        数据库启动：

service mysqld start;

******.pid failed   data文件夹没有写入权限 chmod –R 755 data

/usr/local/mysql-proxy/bin/mysql-proxy --defaults-file=/usr/local/mysql-proxy/conf/online.cnf &

或者：cd /usr/local/mysql-proxy/bin/

./mysql-proxyd online start

mysql代理池启动

数据库延迟：

show slave status;

Slave_IO_Running: Yes 
Slave_SQL_Running: No 

stop slave;

set global sql_slave_skip_counter =1;

start slave;

show slave status;

如果：

Slave_IO_Running: No 
Slave_SQL_Running: Yes

   

 找到Master_Host对应IP的主机，登录主机

( 132)mysql> show master status;

+------------------+----------+--------------+---------------------------------------------+-------------------+

| File  | Position | Binlog_Do_DB | Binlog_Ignore_DB         | Executed_Gtid_Set |

+------------------+----------+--------------+---------------------------------------------+-------------------+

|mysql-bin.000031|20345138||mysql,performance_schema,information_schema |      |

+------------------+----------+--------------+---------------------------------------------+-------------------+

(131) mysql > stop slave;

(131) mysql > stop slave;

(131) mysql > change master to master_Log_File='mysql-bin.000031', Master_Log_Pos=20345138;

(131) mysql > start slave;

show master status;

查看mysql的最大连接数：show variables like ‘max_connections’;

查看当前mysql的连接状况： show full processlist;

临时设置mysql变量：

set global max_connections = 3000;   // 重启后失效

vim /etc/my.cnf