用 brew 將 mysql 從5.6.22升級到了5.7, 啟動mysql服務以后發現登錄不進去, 原來的密碼失效, 應該是兩個版本的 mysql.user表結構的差異造成的, 為了保留之前的數據, 所以卸載了5.7.x. 卸載以讓命令后重新指向5.6.22, 用mysql.server命令啟動mysql, 這個時候報錯了,啟動不了:

. ERROR! The server quit without updating PID file (/usr/local/var/mysql/xxx.local.pid). 此處的 xxx是我電腦的名字,下同

這個時候先不要去搜索引擎搜索以上的錯誤提示,不然會找到很多不同的無效的解決方案,要定位問題還是先查看日志,避免做無用功. 我剛開始就是這么做的,浪費了不少時間.

查看日志/usr/local/var/mysql/xxx.local.err, 發現以下問題:

2016-08-03 18:18:59 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).

2016-08-03 18:18:59 81707 [Warning] Setting lower_case_table_names=2 because file system for /usr/local/var/mysql/ is case insensitive

2016-08-03 18:18:59 81707 [Note] Plugin 'FEDERATED' is disabled.

2016-08-03 18:18:59 81707 [Note] InnoDB: Using atomics to ref count buffer pool pages

2016-08-03 18:18:59 81707 [Note] InnoDB: The InnoDB memory heap is disabled

2016-08-03 18:18:59 81707 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins

2016-08-03 18:18:59 81707 [Note] InnoDB: Memory barrier is not used

2016-08-03 18:18:59 81707 [Note] InnoDB: Compressed tables use zlib 1.2.3

2016-08-03 18:18:59 81707 [Note] InnoDB: Using CPU crc32 instructions

2016-08-03 18:18:59 81707 [Note] InnoDB: Initializing buffer pool, size = 128.0M

2016-08-03 18:18:59 81707 [Note] InnoDB: Completed initialization of buffer pool

2016-08-03 18:18:59 81707 [Note] InnoDB: Highest supported file format is Barracuda.

InnoDB: No valid checkpoint found.

InnoDB: If this error appears when you are creating an InnoDB database,

InnoDB: the problem may be that during an earlier attempt you managed

InnoDB: to create the InnoDB data files, but log file creation failed.

InnoDB: If that is the case, please refer to

InnoDB: http://dev.mysql.com/doc/refman/5.6/en/error-creating-innodb.html

2016-08-03 18:18:59 81707 [ERROR] Plugin 'InnoDB' init function returned error.

2016-08-03 18:18:59 81707 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.

2016-08-03 18:18:59 81707 [ERROR] Unknown/unsupported storage engine: InnoDB

2016-08-03 18:18:59 81707 [ERROR] Aborting

重點在:

InnoDB: to create the InnoDB data files, but log file creation failed.

通過這個關鍵點 google 了一下, 找到解決方法:

刪除ib_logfile0和ib_logfile1這兩個文件,不過最好是重命名這兩個文件,就算此方案無效, 還有補救的機會. 接著再啟動mysql服務器, ok 了.

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