XAMPP mysql无法启动

XAMPP 版本3.2.4

之前就碰到过一次，直接重装xampp，问题解决。

今天又碰到了，

15:48:46  [mysql]    Error: MySQL shutdown unexpectedly.
15:48:46  [mysql]   This may be due to a blocked port, missing dependencies,
15:48:46  [mysql]   improper privileges, a crash, or a shutdown by another method.
15:48:46  [mysql]   Press the Logs button to view error logs and check
15:48:46  [mysql]   the Windows Event Viewer for more clues
15:48:46  [mysql]   If you need more help, copy and post this
15:48:46  [mysql]   entire log window on the forums

查看mysql_error.log

2021-08-05 15:06:57 0 [Note] InnoDB: Mutexes and rw_locks use Windows interlocked functions
2021-08-05 15:06:57 0 [Note] InnoDB: Uses event mutexes
2021-08-05 15:06:57 0 [Note] InnoDB: Compressed tables use zlib 1.2.11
2021-08-05 15:06:57 0 [Note] InnoDB: Number of pools: 1
2021-08-05 15:06:57 0 [Note] InnoDB: Using SSE2 crc32 instructions
2021-08-05 15:06:57 0 [Note] InnoDB: Initializing buffer pool, total size = 1G, instances = 1, chunk size = 128M
2021-08-05 15:06:57 0 [Note] InnoDB: Completed initialization of buffer pool
2021-08-05 15:06:57 0 [Note] InnoDB: 128 out of 128 rollback segments are active.
2021-08-05 15:06:57 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2021-08-05 15:06:57 0 [Note] InnoDB: Setting file 'E:\xampp\mysql\data\ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2021-08-05 15:06:57 0 [Note] InnoDB: File 'E:\xampp\mysql\data\ibtmp1' size is now 12 MB.
2021-08-05 15:06:57 0 [Note] InnoDB: Waiting for purge to start
2021-08-05 15:06:57 0 [Note] InnoDB: 10.4.18 started; log sequence number 300378; transaction id 8
2021-08-05 15:06:57 0 [Note] InnoDB: Loading buffer pool(s) from E:\xampp\mysql\data\ib_buffer_pool
2021-08-05 15:06:57 0 [Note] Plugin 'FEEDBACK' is disabled.
2021-08-05 15:06:57 0 [Note] InnoDB: Buffer pool(s) load completed at 210805 15:06:57
2021-08-05 15:06:57 0 [Note] Server socket created on IP: '::'.
InnoDB: using atomic writes.

按照https://www.cnblogs.com/4php/p/4122210.html删除文件后，依然不能启动。

在xampp面板上重装mysql，又出现如下报错：

2021-08-05 15:07:42 0 [Note] InnoDB: Mutexes and rw_locks use Windows interlocked functions
2021-08-05 15:07:42 0 [Note] InnoDB: Uses event mutexes
2021-08-05 15:07:42 0 [Note] InnoDB: Compressed tables use zlib 1.2.11
2021-08-05 15:07:42 0 [Note] InnoDB: Number of pools: 1
2021-08-05 15:07:42 0 [Note] InnoDB: Using SSE2 crc32 instructions
2021-08-05 15:07:42 0 [Note] InnoDB: Initializing buffer pool, total size = 1G, instances = 1, chunk size = 128M
2021-08-05 15:07:43 0 [Note] InnoDB: Completed initialization of buffer pool
2021-08-05 15:07:43 0 [Note] InnoDB: 128 out of 128 rollback segments are active.
2021-08-05 15:07:43 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2021-08-05 15:07:43 0 [Note] InnoDB: Setting file 'E:\xampp\mysql\data\ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2021-08-05 15:07:43 0 [Note] InnoDB: File 'E:\xampp\mysql\data\ibtmp1' size is now 12 MB.
2021-08-05 15:07:43 0 [Note] InnoDB: Waiting for purge to start
2021-08-05 15:07:43 0 [Note] InnoDB: 10.4.18 started; log sequence number 300405; transaction id 8
2021-08-05 15:07:43 0 [Note] Plugin 'FEEDBACK' is disabled.
2021-08-05 15:07:43 0 [Note] InnoDB: Loading buffer pool(s) from E:\xampp\mysql\data\ib_buffer_pool
2021-08-05 15:07:43 0 [Note] InnoDB: Buffer pool(s) load completed at 210805 15:07:43
2021-08-05 15:07:43 0 [Note] Server socket created on IP: '::'.
2021-08-05 15:07:43 0 [ERROR] mysqld.exe: Table '.\mysql\db' is marked as crashed and last (automatic?) repair failed
2021-08-05 15:07:43 0 [ERROR] Fatal error: Can't open and lock privilege tables: Table '.\mysql\db' is marked as crashed and last (automatic?) repair failed
2021-08-05 15:07:43 0 [ERROR] Aborting
InnoDB: using atomic writes.

直接把db文件夹标为crash，并且修复失败。

最后按照https://stackoverflow.com/questions/56847804/xampp-mysql-service-crash-after-reboot的方法：

点击xampp面板上的Shell按钮进入命令框，输入命令：
```
mysqld –-console –-skip-grant-tables –-skip-external-locking
```
保持上一个窗口不关闭，重新在面板上点开一个Shell，输入指令：
```
mysqlcheck -r --databases mysql --use-frm
```
等命令窗口不再变化，再关闭命令窗口，重新启动xampp，问题解决。

到现在，已经可以正常打开mysql server 了。

如果出现“table *** doesn't exist in engine”,在db文件夹中发现文件都在。这时候需要在回收站中找到删除的ibdata1文件，还原ibdata1，记得是最早删除的那个。

还原后，重启mysql，打开navicate，终于回来了。

转载请注明出处！

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