First of all, my MySQL DB and Linux skills are not so good. I spent several days searching for a solution and tried several approaches. The following approach is the one I came furthest with.
My SD card, on which my MariaDB was installed, is corrupt. However, I was able to recover the /var/lib/mysql directory.
I set up a new Ubuntu installation and a clean MySQL database.
After I copied the recovered database directories into the new folder (without ibdata) and restarted the database, I could see the tables but got the error '1146 table doesn't exist'.
Then I also copied the file ibdata and changed the permissions (chmod, chown, chgrp). But after that I can't start the MySQL service anymore. I get the following error:
[Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
[ERROR] InnoDB: Cannot create log files in read-only mode
[ERROR] InnoDB: Plugin initialization aborted with error Read only transaction
[ERROR] Plugin 'InnoDB' init function returned error.
[ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
[ERROR] Failed to initialize builtin plugins.
[ERROR] Aborting
I tried innodb_force_recovery 0-6 without success.
Does anyone have a hint for me what the error means and how I can recover my database?
Best Answer
It seems your MySQL directory is in read-only mode:
[ERROR] InnoDB: Cannot create log files in read-only mode. Be sure to have write permission for the directory and the files inside it.That said, if your SDcard failed, chances are that data itself are corrupted beyond repair.