錯誤日志如下：

170324 11:18:41 mysqld_safe Logging to '/Applications/MAMP/logs/mysql_error.log'.

170324 11:18:41 mysqld_safe Starting mysqld daemon with databases from /Library/Application Support/appsolute/MAMP PRO/db/mysql56

2017-03-24 11:18:41 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).

2017-03-24 11:18:41 0 [Note] --secure-file-priv is set to NULL. Operations related to importing and exporting data are disabled

2017-03-24 11:18:41 0 [Note] /Applications/MAMP/Library/bin/mysqld (mysqld 5.6.35) starting as process 2644 ...

2017-03-24 11:18:41 2644 [Warning] Setting lower_case_table_names=2 because file system for /Library/Application Support/appsolute/MAMP PRO/db/mysql56/ is case insensitive

2017-03-24 11:18:41 2644 [Note] Plugin 'FEDERATED' is disabled.

2017-03-24 11:18:41 2644 [Note] InnoDB: Using atomics to ref count buffer pool pages

2017-03-24 11:18:41 2644 [Note] InnoDB: The InnoDB memory heap is disabled

2017-03-24 11:18:41 2644 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins

2017-03-24 11:18:41 2644 [Note] InnoDB: Memory barrier is not used

2017-03-24 11:18:41 2644 [Note] InnoDB: Compressed tables use zlib 1.2.8

2017-03-24 11:18:41 2644 [Note] InnoDB: Using CPU crc32 instructions

2017-03-24 11:18:41 2644 [Note] InnoDB: Initializing buffer pool, size = 128.0M

2017-03-24 11:18:41 2644 [Note] InnoDB: Completed initialization of buffer pool

2017-03-24 11:18:41 2644 [Note] InnoDB: Highest supported file format is Barracuda.

2017-03-24 11:18:41 2644 [Note] InnoDB: The log sequence numbers 1704703 and 1704703 in ibdata files do not match the log sequence number 1704713 in the ib_logfiles!

2017-03-24 11:18:41 2644 [Note] InnoDB: Database was not shutdown normally!

2017-03-24 11:18:41 2644 [Note] InnoDB: Starting crash recovery.

2017-03-24 11:18:41 2644 [Note] InnoDB: Reading tablespace information from the .ibd files...

2017-03-24 11:18:41 2644 [ERROR] InnoDB: Attempted to open a previously opened tablespace. Previous tablespace db_patients/tb_patients uses space ID: 3 at filepath: ./db_patients/tb_patients.ibd. Cannot open tablespace mysql/slave_relay_log_info which uses space ID: 3 at filepath: ./mysql/slave_relay_log_info.ibd

2017-03-24 11:18:41 7fffcc2c73c0 InnoDB: Operating system error number 2 in a file operation.

InnoDB: The error means the system cannot find the path specified.

InnoDB: If you are installing InnoDB, remember that you must create

InnoDB: directories yourself, InnoDB does not create them.

InnoDB: Error: could not open single-table tablespace file ./mysql/slave_relay_log_info.ibd

InnoDB: We do not continue the crash recovery, because the table may become

InnoDB: corrupt if we cannot apply the log records in the InnoDB log to it.

InnoDB: To fix the problem and start mysqld:

InnoDB: 1) If there is a permission problem in the file and mysqld cannot

InnoDB: open the file, you should modify the permissions.

InnoDB: 2) If the table is not needed, or you can restore it from a backup,

InnoDB: then you can remove the .ibd file, and InnoDB will do a normal

InnoDB: crash recovery and ignore that table.

InnoDB: 3) If the file system or the disk is broken, and you cannot remove

InnoDB: the .ibd file, you can set innodb_force_recovery > 0 in my.cnf

InnoDB: and force InnoDB to continue crash recovery here.

170324 11:18:41 mysqld_safe mysqld from pid file /Applications/MAMP/tmp/mysql/mysql.pid ended

其中關鍵的一行是：

InnoDB: Attempted to open a previously opened tablespace. Previous tablespace db_patients/tb_patients uses space ID: 3 at filepath: ./db_patients/tb_patients.ibd. Cannot open tablespace mysql/slave_relay_log_info which uses space ID: 3 at filepath: ./mysql/slave_relay_log_info.ibd

解決辦法：

一、打開MAMP PRO，點擊主界面左側LANGUAGES中PHP，右側Extensions分類中點擊Manually enable other extensions右側按鈕(或者打開菜單欄File->Edit Template->MySQL->7.1.1(選擇你的版本))，這時打開了一個文本，找到

[mysqld]

注意帶上中括號，在[mysqld]下面加一行：

innodb_force_recovery = 1

二、啟動mySQL，成功后再關閉；

三、重新打開那個文本，刪除添加的那一行；

四、再打開mySQL，完畢。

總結

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