Mysql 錯誤too many connections處理方案。本站提示廣大學習愛好者：（Mysql 錯誤too many connections處理方案）文章只能為提供參考，不一定能成為您想要的結果。以下是Mysql 錯誤too many connections處理方案正文
Mysql 錯誤提示too many connections，最近遇到這個錯誤，經過上網查材料處理了，這裡記載下，協助有需求的冤家，
處理辦法是修正/etc/mysql/my.cnf,添加以下一行:
set-variable = max_connections=500
或在啟動命令中加上參數 max_connections=500
就是修正最大銜接數,然後重啟mysql.默許的銜接數是100,太少了,所以容易呈現如題錯誤.
以下是mysql.com網站的相關闡明:
If you get a Too many connections error when you try to connect to the mysqld server, this means that all available connections are in use by other clients.
The number of connections allowed is controlled by the max_connections system variable. Its default value is 100. If you need to support more connections, you should restart mysqld with a larger value for this variable.
mysqld actually allows max_connections+1 clients to connect. The extra connection is reserved for use by accounts that have the SUPER privilege. By granting the SUPER privilege to administrators and not to normal users (who should not need it), an administrator can connect to the server and use SHOW PROCESSLIST to diagnose problems even if the maximum number of unprivileged clients are connected. See Section 13.5.4.19, “SHOW PROCESSLIST Syntax”.
The maximum number of connections MySQL can support depends on the quality of the thread library on a given platform. Linux or Solaris should be able to support 500-1000 simultaneous connections, depending on how much RAM you have and what your clients are doing. Static Linux binaries provided by MySQL AB can support up to 4000 connections.
1.能夠是mysql的max connections設置的問題
2.能夠是屢次insert,update操作沒有封閉session,需求在spring裡配置transaction支持。
處理:
1.修正tomcat裡的session 的time-out時間增加為20,(不是必改項)
2.對處置量大的對數據庫insert或update的操作提供transaction支持.
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上面的是處理方法：
com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Data source rejected establishment of connection, message from server: "Too many connections"
緣由：
由於你的mysql裝置目錄下的my.ini中設定的並發銜接數太少或許零碎忙碌招致銜接數被占滿
處理方式：
翻開MYSQL裝置目錄翻開MY.INI找到max_connections（在大約第93行）默許是100 普通設置到500～1000比擬適宜，重啟mysql,這樣1040錯誤就處理啦。
max_connections=1000
一定要重新啟動MYSQL才干失效
CMD->
net stop mysql
net start mysql
關於改動innodb_log_file_size後無法啟動mysql的問題
innodb_buffer_pool_size=768M innodb_log_file_size=256M innodb_log_buffer_size=8M innodb_additional_mem_pool_size=4M innodb_flush_log_at_trx_commit=0 innodb_thread_concurrency=20
以上是對innodb引擎的初步優化, 發現是更新innodb_log_file_size=256M時分呈現了問題，只需加上這個就無法啟動,
後來才知道原來要STOP服務先，然後再刪除原來的文件………
翻開/MySQL Server 5.5/data
刪除ib_logfile0, ib_logfile1........ib_logfilen
再開啟選項，成功啟動。
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