Reasons for MySQL reporting 1040too many connections and Solutions

Catalog

Error reason ：

terms of settlement

summary  

MySQL Report errors 1040 ‘Too many connections’

Error reason ：

The actual number of connections exceeded mysql The maximum number of connections allowed , Too many visits ,MySQL Server can't resist .

terms of settlement

1、 modify max_connections, If this value is already large ,2、 At this time, we should consider increasing the pressure of decentralized reading from the server ;

Windows find mysql.ini（Linux modify /etc/my.cnf file , stay [mysqld] Newly added max_connections=N）. Modify the maximum number of connections allowed max_connections=N, The default is 100 Generally set to 500～1000 More appropriate （ This is based on the condition that the machine can support , Because if there are more connections , Be situated between MySQL A connection buffer is provided for each connection , It's going to cost more memory , So adjust the value properly , Do not blindly increase the set value .）, The last restart mysql, Make sure you reboot .

net stop mysqlnet start mysql

2、 Temporarily modify and view the maximum number of connections ：

show variables like ‘%max_connections%';

Wildcards view the number of connections in the current state , To determine the size of the value .

show global status like ‘Max_used_connections';

Modify the order ：set global max_connections=1000;（ restart mysql It will fail after service ）

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