Mamp不会启动mysql服务器（mac）

Question

我已经启动并运行（wordpress）并且没有问题。然后服务器突然停机，并且没有再次启动。他们是关于这个话题的一些其他线索，但我一直没能弄清楚。我已经确认没有mysql进程....这是我的mysql_error_log：

161201 01:04:22 mysqld_safe Starting mysqld daemon with databases from /Applications/MAMP/db/mysql56 
2016-12-01 01:04:23 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details). 
2016-12-01 01:04:23 0 [Note] /Applications/MAMP/Library/bin/mysqld (mysqld 5.6.33) starting as process 49478 ... 
2016-12-01 01:04:23 49478 [Warning] Setting lower_case_table_names=2 because file system for /Applications/MAMP/db/mysql56/ is case insensitive 
2016-12-01 01:04:23 49478 [Note] Plugin 'FEDERATED' is disabled. 
2016-12-01 01:04:23 49478 [Note] InnoDB: Using atomics to ref count buffer pool pages 
2016-12-01 01:04:23 49478 [Note] InnoDB: The InnoDB memory heap is disabled 
2016-12-01 01:04:23 49478 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins 
2016-12-01 01:04:23 49478 [Note] InnoDB: Memory barrier is not used 
2016-12-01 01:04:23 49478 [Note] InnoDB: Compressed tables use zlib 1.2.8 
2016-12-01 01:04:23 49478 [Note] InnoDB: Using CPU crc32 instructions 
2016-12-01 01:04:23 49478 [Note] InnoDB: Initializing buffer pool, size = 128.0M 
2016-12-01 01:04:23 49478 [Note] InnoDB: Completed initialization of buffer pool 
2016-12-01 01:04:23 49478 [Note] InnoDB: Highest supported file format is Barracuda. 
2016-12-01 01:04:23 49478 [Note] InnoDB: The log sequence numbers 0 and 0 in ibdata files do not match the log sequence number 9969064 in the ib_logfiles! 
2016-12-01 01:04:23 49478 [Note] InnoDB: Database was not shutdown normally! 
2016-12-01 01:04:23 49478 [Note] InnoDB: Starting crash recovery. 
2016-12-01 01:04:23 49478 [Note] InnoDB: Reading tablespace information from the .ibd files... 
2016-12-01 01:04:23 49478 [ERROR] InnoDB: Attempted to open a previously opened tablespace. Previous tablespace mysql/slave_worker_info uses space ID: 5 at filepath: ./mysql/slave_worker_info.ibd. Cannot open tablespace wordpress/wp_term_taxonomy which uses space ID: 5 at filepath: ./wordpress/wp_term_taxonomy.ibd 
2016-12-01 01:04:23 7fffc52a43c0 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 ./wordpress/wp_term_taxonomy.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. 
161201 01:04:23 mysqld_safe mysqld from pid file /Applications/MAMP/tmp/mysql/mysql.pid ended 

Answer 1

这意味着你的一个表损坏了。奇怪的是，这经常发生在机器崩溃之后。 这是我如何固定它：

1. 开放的my.cnf（在MAMP>文件>编辑模板>的MySQL）
2. 添加一行：innodb_force_recovery = 1个
3. 保存和启动服务器

表格可能仍然会被破坏，但是应该启动mysql。这意味着你可能必须更换表：wp_term_taxonomy

注意：如果innodb_force_recovery = 1不起作用，尝试在数字上升： innodb_force_recovery = 2（等） 但谨慎行事。这里是MySQL对此设置的警告： https://dev.mysql.com/doc/refman/5.5/en/forcing-innodb-recovery.html

Answer 2

我能够通过导航到/ Applications/MAMP/db/mysql56并删除我创建的数据库的文件夹来获得此工作。您可能可以将它们移动到桌面并重新导入它们，但我不需要它，因此我只是将其删除，然后重新启动并运行。

Answer 3

所有的MAMP数据库都存储在/Library/Application Support/appsolute/MAMP PRO/db/mysql56/单独的文件夹中。根据您的错误日志，存在./wordpress/wp_term_taxonomy.ib的问题 - 也就是数据库中的term_taxonomywordpress。解决这个问题的一种方法是简单地删除该数据库的所有痕迹 - 我希望你有一个来自它被损坏之前的副本来恢复它。这是如何删除它：

1. 退出MAMP服务器。

2. 删除数据库文件夹及其内容 - 在你的情况下，数据库名称是WordPress的：

   $ rm -r /Library/Application\ Support/appsolute/MAMP\ PRO/db/mysql56/wordpress 
   

3. 删除三个InnoDB的文件ib_logfile0，ib_logfile1和ibdata1中。不要害怕;新的副本将在您下次从MAMP内启动MySQL时创建。

   $ rm /Library/Application\ Support/appsolute/MAMP\ PRO/db/mysql56/ib_logfile0 
   $ rm /Library/Application\ Support/appsolute/MAMP\ PRO/db/mysql56/ib_logfile1 
   $ rm /Library/Application\ Support/appsolute/MAMP\ PRO/db/mysql56/ibdata1 
   

4. 启动MAMP服务器。