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输入的命令如下：
/usr/local/mysql/bin/mysqladmin -uroot -pyyyyyy variables |grep max_connections
nano /etc/my.cnf
max_connections=200
service mysql restart
在mysql中最大并发连接数修改方法只要在my.cnf文件加找到max_connections 或修改max_connections 的参考即可了，后面的参数越大就是并发越大了
1.先查看下当前MYSQL的最大连接数 注意，root替换成你的数据库，不过一般默认就是root,password是数据库密码，) 入以上命令后会显示下面的信息，这个是最大连接数是100
[root@localhost ~]# /usr/local/mysql/bin/mysqladmin -uroot -pyyyyyyyy variables |grep max_connections
2.修改最大连接数为200
[root@localhost ~]# nano /etc/my.cnf
输入以上命令后会进入my.cnf文件内容，在其中加入下面这行代码
max_connections=200
使用上下箭头移动光标，输入后按ctrl+o组合键后保存，保存的时候要再按回车键确定的，确定后按ctrl+x组合键退出回到命令行
3.最后一步就是重启mysql [root@localhost ~]# service mysql restart //重启mysql的命令
LINUX命令界面如下：
Xshell for Xmanager Enterprise 5 (Build 0488) Copyright (c) 2002-2014 NetSarang Computer, Inc. All rights reserved.
Type `help‘ to learn how to use Xshell prompt. [c:\~]$
Connecting to 203.86.8.114:22... Connection established. To escape to local shell, press ‘Ctrl+Alt+]‘.
WARNING! The remote SSH server rejected X11 forwarding request. Last login: Wed Aug 19 17:25:35 2015 from 61.143.61.19 [root@localhost ~]# /usr/local/mysql/bin/mysqladmin -uroot -pyyyyyy variables |grep max_connections | max_connections | 10
| [root@localhost ~]# nano /etc/my.cnf
[root@localhost ~]# /usr/local/mysql/bin/mysqladmin -uroot -pzhengou$%#1980 variables |grep max_connections error: Found option without preceding group in config file: /etc/my.cnf at line: 3 Fatal error in defaults handling. Program aborted /usr/local/mysql/bin/mysqladmin: connect to server at ‘localhost‘ failed error: ‘Too many connections‘
[root@localhost ~]# service mysql restart error: Found option without preceding group in config file: /etc/my.cnf at line: 3 Fatal error in defaults handling. Program aborted error: Found option without preceding group in config file: /etc/my.cnf at line: 3 Fatal error in defaults handling. Program aborted error: Found option without preceding group in config file: /etc/my.cnf at line: 3 Fatal error in defaults handling. Program aborted error: Found option without preceding group in config file: /etc/my.cnf at line: 3 Fatal error in defaults handling. Program aborted Shutting down MySQL.. [确定] error: Found option without preceding group in config file: /etc/my.cnf at line: 3 Fatal error in defaults handling. Program aborted error: Found option without preceding group in config file: /etc/my.cnf at line: 3 Fatal error in defaults handling. Program aborted Starting MySQL. [确定]
[root@localhost ~]# /usr/local/mysql/bin/mysqladmin -uroot -pyyyyyyy variables |grep max_connections error: Found option without preceding group in config file: /etc/my.cnf at line: 3 Fatal error in defaults handling. Program aborted | max_connections | 151 |
[root@localhost ~]# nano /etc/my.cnf
GNU nano 1.3.12 File: /etc/my.cnf
max_connections=200
# Example MySQL config file for medium systems. # # This is for a system with little memory (32M - 64M) where MySQL plays # an important part, or systems up to 128M where MySQL is used together with # other programs (such as a web server) # # MySQL programs look for option files in a set of # locations which depend on the deployment platform. # You can copy this option file to one of those # locations. For information about these locations, see: # http://dev.mysql.com/doc/mysql/en/option-files.html # # In this file, you can use all long options that a program supports. # If you want to know which options a program supports, run the program # with the "--help" option.
# The following options will be passed to all MySQL clients [client] [ Read 146 lines ] ^G Get Help ^O WriteOut ^R Read File ^Y Prev Page ^K Cut Text ^C Cur Pos ^X Exit ^J Justify ^W Where Is ^V Next Page ^U UnCut Text ^T To Spell
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原文地址：http://www.cnblogs.com/Snowfun/p/4742933.html
