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mysql的1135错误解决方法

Jun 07, 2016 pm 04:17 PM
mysql method solve mistake

mysql的1135的报错信息如下: SQLSTATE[HY000] [1135] Can't create a new thread (errno 12); if you are not out of available memory, you can consult the manual for a possible OS-dependent bug 解决方案: 修改my.ini,增加2个参数: innodb_thread_

   mysql的1135的报错信息如下:

  SQLSTATE[HY000] [1135] Can't create a new thread (errno 12); if you are not out of available memory, you can consult the manual for a possible OS-dependent bug

  解决方案:

  修改my.ini,增加2个参数:

  innodb_thread_sleep_delay=40

  wait_timeout=100

  interactive_timeout=100

  重启MYSQL服务器

  以上的问题主要是线程数太多:

  1.是连接数太多

  2.是每个线程允许的生命周期太长,就跟http的timeout一样。

  LINUX下检查连接数的方法如下:

  ps -aux | grep mysql

  【补充知识】================================

  MySQL中的配置参数interactive_timeout和wait_timeout

  (1)interactive_timeout:

  参数含义:服务器关闭交互式连接前等待活动的秒数。交互式客户端定义为在mysql_real_connect()中使用CLIENT_INTERACTIVE选项的客户端。

  参数默认值:28800秒(8小时)

  (2)wait_timeout:

  参数含义:服务器关闭非交互连接之前等待活动的秒数。

  在线程启动时,根据全局wait_timeout值或全局interactive_timeout值初始化会话wait_timeout值,取决于客户端类型(由mysql_real_connect()的连接选项CLIENT_INTERACTIVE定义)。

  参数默认值:28800秒(8小时)

  MySQL服务器所支持的最大连接数是有上限的,因为每个连接的建立都会消耗内存,因此我们希望客户端在连接到MySQL Server处 理完相应的操作后,应该断开连接并释放占用的内存。如果你的MySQL Server有大量的闲置连接,他们不仅会白白消耗内存,而且如果连接一直在累加而不断开,最终肯定会达到MySQL Server的连接上限数,这会报'too many connections'的错误。对于wait_timeout的值设定,应该根据系统的运行情况来判断。在系统运行一段时间后,可以通过show processlist命令查看当前系统的连接状态,如果发现有大量的sleep状态的连接进程,则说明该参数设置的过大,可以进行适当的调整小些。

  问题:

  如果在配置文件my.cnf中只设置参数wait_timeout=100,则重启服务器后进入,执行:

  Mysql> show variables like “%timeout%”;

  会发现参数设置并未生效,仍然为28800(即默认的8个小时)。

  查询资料后,,要同时设置interactive_timeout和wait_timeout才会生效。

  【mysqld】

  Wait_timeout=100

  Interactive_timeout=100

  重启MySQL Server进入后,查看设置已经生效。

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