【已解答】mysqld无法启动请问怎么解决

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问题描述：mysqld无法启动
  

相关截图（日志、错误）：

Barracuda.

2023-05-15 22:25:48 15263 [Note] InnoDB: Log scan progressed past the checkpoint lsn 10125035617

2023-05-15 22:25:48 15263 [Note] InnoDB: Database was not shutdown normally!

2023-05-15 22:25:48 15263 [Note] InnoDB: Starting crash recovery.

2023-05-15 22:25:48 15263 [Note] InnoDB: Reading tablespace information from the .ibd files...

2023-05-15 22:25:48 15263 [ERROR] InnoDB: Attempted to open a previously opened tablespace. Previous tablespace www_007xbw_com/wp_ocw_contact_content uses space ID: 10 at filepath: ./www_007xbw_com/wp_ocw_contact_content.ibd. Cannot open tablespace www_guziyuanw_co/wp_cao_ref_log which uses space ID: 10 at filepath: ./www_guziyuanw_co/wp_cao_ref_log.ibd

2023-05-15 22:25:48 2b5b1a658cc0  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 ./www_guziyuanw_co/wp_cao_ref_log.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.

您好，这个错误信息显示了在尝试打开表空间 www_guziyuanw_co/wp_cao_ref_log 时发生了错误。
这个错误通常是由于使用了相同的 space ID 来创建两个或多个表空间，或者在删除表空间时没有正确地删除表空间数据文件导致的。您可根据以下方法进行排查：
1、确认错误信息中涉及的表空间名称和文件路径是否正确。
2、确认您是否使用了相同的 space ID 创建了多个表空间。如果是这种情况，请尝试修改其中一个表空间的 space ID，然后重启 MySQL
3、如果您在删除表空间时没有正确地删除表空间数据文件，请手动删除这些文件。在删除表空间文件之前，请确保已经正确地备份了数据