MySQL问题汇总

以下出现的MySQL问题均为本人亲历，所以本文的“问题汇总”实际为个人版本的“问题汇总”，如有其它MySQL问题，欢迎Email联系我共同讨论！

MySQL初始化问题

shell> mysql
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)

shell> service mysqld restart
Stopping mysqld:                                           [  OK  ]
MySQL Daemon failed to start.
Starting mysqld:                                           [FAILED]

#日志中报错如下：
[ERROR] Fatal error: mysql.user table is damaged. Please run mysql_upgrade.
[ERROR] Aborting

#这种情况本人是在MySQL5.1到5.7版本升级时遇到的，升级到5.7后，数据库启动失败
#解决的办法就是重新初始化数据库

shell> rm -fr /var/lib/mysql
shell> mysqld --initialize --user=mysql
shell> service mysqld restart
Stopping mysqld:                                           [  OK  ]
Starting mysqld:                                           [  OK  ]

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mysql-files文件问题

#MySQL启动失败，日志中报错如下：
[ERROR] Failed to access directory for --secure-file-priv. Please make sure that directory exists and is accessible by MySQL Server. Supplied value : /var/lib/mysql-files

#造成这种情况可能是因为mysql-files文件夹不存在或权限错误
#解决办法如下：
shell> touch /var/lib/mysql-files
shell> chown mysql:mysql /var/lib/mysql-files
shell> service mysqld restart
Stopping mysqld:                                           [  OK  ]
Starting mysqld:                                           [  OK  ]