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mysql啟動之 ERROR! The server quit without updating PID file (/usr/local/mysql/data/gujingdeMacBook-Pro

啟動mysql時,出現如下錯誤:

ERROR! The server quit without updating PID file (/usr/local/mysql/data/gujingdeMacBook-Pro.local.pid).
可能的解決方式:
1、可能是/usr/local/mysql/data/資料目錄mysql使用者沒有許可權(修改資料目錄的許可權)
解決方法 :給予許可權,執行 sudo chmod -R 777 /usr/local/mysql/data/ 然後重新啟動mysql

2、可能程序裡已經存在mysql程序
解決方法:用命令“ps -ef|grep mysqld”檢視是否有mysqld程序,如果有使用“kill -9 程序號”殺死,然後重新啟動mysqld!

3、可能是第二次在機器上安裝mysql,有殘餘資料影響了服務的啟動。
解決方法:去mysql的二進位制日誌目錄看看,如果存在mysql-binlog.index,就趕快把它刪除掉吧

4、mysql在啟動時沒有指定配置檔案時會使用/etc/my.cnf配置檔案,請開啟這個檔案檢視在[mysqld]下有沒有指定資料目錄(datadir)。
解決方法:請在[mysqld]下設定這一行:datadir = /opt/mysql/data

5、skip-federated欄位問題
解決方法:檢查一下/etc/my.cnf檔案中有沒有沒被註釋掉的skip-federated欄位,如果有就立即註釋掉吧。

6、錯誤日誌目錄不存在
解決方法:使用“chown” “chmod”命令賦予mysql所有者及許可權

7、selinux惹的禍,如果是centos系統,預設會開啟selinux
解決方法:先臨時改為警告模式:[[email protected] php]# setenforce 0
然後開啟/etc/sysconfig/selinux,把SELINUX=enforcing改為SELINUX=disabled

附加:
經驗之談:
還有一個原因可能是:
檢視配置檔案/usr/local/mysql/my.cnf裡有沒有innodb_buffer_pool_size這個引數
innodb_buffer_pool_size:主要作用是快取innodb表的索引,資料,插入資料時的緩衝;
預設值:128M;
專用mysql伺服器設定此值的大小: 系統記憶體的70%-80%最佳。
如果你的系統記憶體不大,檢視這個引數,把它的值設定小一點吧

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