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MySQL修改connect_timeout(连接超时)全局变量

MySQL修改connect_timeout(连接超时)全局变量

作者: 皇阿玛PLUS | 来源:发表于2017-02-23 14:38 被阅读11375次

    Java程序员儿反应服务器上的MySQL连上去之后,总是过一会儿就断开连接了,工作效率低,跟松哥提需求,增加连接时间,减少断开次数,和刷新页面的等待时间。我自己本地用telnet测试,读秒试了下,果然是过了几秒就断开了。

    telnet 测试数据库的连接超时时间
    telnet 121.43.161.35 3306

    1.登录mysql数据库
    [root@iZbp11rfoyeescusr9ha9qZ conf]# mysql -u root -p

    2.查询匹配“timeout”的全局变量
    MySQL [(none)]> show global variables like '%timeout%';
    +----------------------------------------+--------------+
    | Variable_name | Value |
    +----------------------------------------+--------------+
    | connect_timeout | 10 |
    | delayed_insert_timeout | 300 |
    | have_statement_timeout | YES |
    | innodb_flush_log_at_timeout | 1 |
    | innodb_lock_wait_timeout | 120 |
    | innodb_rollback_on_timeout | OFF |
    | interactive_timeout | 28800 |
    | lock_wait_timeout | 31536000 |
    | net_read_timeout | 30 |
    | net_write_timeout | 60 |
    | rpl_stop_slave_timeout | 31536000 |
    | slave_net_timeout | 60 |
    | wait_timeout | 28800 |
    +-----------------------------------------+--------------+
    13 rows in set (0.01 sec)

    3.设置全局变量connect_timeout为12小时(12*3600=43200)
    MySQL [(none)]> SET GLOBAL connect_timeout = 43200;
    Query OK, 0 rows affected (0.00 sec)

    4.再次查看,确认参数是否修改成功
    MySQL [(none)]> show global variables like '%timeout%';
    +----------------------------------------+--------------+
    | Variable_name | Value |
    +----------------------------------------+--------------+
    | connect_timeout | 43200 |
    | delayed_insert_timeout | 300 |
    | have_statement_timeout | YES |
    | innodb_flush_log_at_timeout | 1 |
    | innodb_lock_wait_timeout | 120 |
    | innodb_rollback_on_timeout | OFF |
    | interactive_timeout | 28800 |
    | lock_wait_timeout | 31536000 |
    | net_read_timeout | 30 |
    | net_write_timeout | 60 |
    | rpl_stop_slave_timeout | 31536000 |
    | slave_net_timeout | 60 |
    | wait_timeout | 28800 |
    +-----------------------------------------+--------------+
    13 rows in set (0.00 sec)

    5.退出数据库
    MySQL [(none)]> exit
    Bye

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