Check MySQL Error Logs and Startup Issues<\/strong><\/h2>It is important to troubleshoot problems starting your MySQL Server. For this, open the MySQL error log and check the logs to see why the server fails to start. You can find the error log on a Windows PC by browsing the location- C:\\Program Files\\MySQL\\MySQL Server nnn\\data.<\/p>
Here replace nnn with the version of MySQL Server you are using. For instance, if you’re using MySQL Server version 8.0, then locate the error log in – C:\\Program Files\\MySQL\\MySQL Server 8.0\\data.<\/p>
For a Unix or Linux distribution, you can find the error log by browsing:<\/strong><\/p>\/usr\/local\/var<\/code><\/p>See this MySQL post<\/a> for additional suggestions on troubleshooting problems starting the server.<\/p>If the problem persists, try to work around the issue as discussed in the next section.<\/p>
Solutions for innodb_force_recovery Not Working<\/strong><\/h2>Following are some workarounds you can use to troubleshoot the ‘InnoDB force recovery not working’ problem:<\/p>
Workaround 1: Controlled InnoDB Force Recovery<\/strong><\/h3>If you have directly used innodb_force_recovery=6, try running it with a value 3 and increase it to values 4, 5 if InnoDB fails to start. The steps are as follows:<\/p>
\n- Use the below commands to start MySQL server:<\/li>\n<\/ul>
innodb_force_recovery=3<\/code><\/p>innodb_purge_threads=0<\/code><\/p>\n- Dump the database with mysqldump tool.<\/li>\n\n\n\n
- Create new empty InnoDB table space and reload the dump.<\/li>\n<\/ul>
<\/p>
Note: <\/strong>If MySQL doesn’t start, use MySQL Server startup script mysqld_safe. It helps in running mysqld server on a Unix machine.<\/p>mysql> #mysqld_safe --innodb_force_recovery=4<\/code><\/p>If this doesn’t work, skip to the next workaround.<\/p>
Workaround 2: Restore MySQL from Backup<\/strong><\/h3>If you cannot start the server, you can access data by restoring the MySQL database from a valid backup (mysqldump) file. You can find the detailed steps on how to restore a MySQL database from mysqldump file, click here<\/a>.<\/p>If you don’t have a backup or it fails to work for you, the only solution is to use a MySQL database repair tool. Stellar Repair for MySQL helps repair severely corrupted InnoDB tables and recover their components.<\/p>
See this MySQL post<\/a> for additional suggestions on troubleshooting problems starting the server.<\/p> If the problem persists, try to work around the issue as discussed in the next section.<\/p> Following are some workarounds you can use to troubleshoot the ‘InnoDB force recovery not working’ problem:<\/p> If you have directly used innodb_force_recovery=6, try running it with a value 3 and increase it to values 4, 5 if InnoDB fails to start. The steps are as follows:<\/p> <\/p> Note: <\/strong>If MySQL doesn’t start, use MySQL Server startup script mysqld_safe. It helps in running mysqld server on a Unix machine.<\/p> If this doesn’t work, skip to the next workaround.<\/p> If you cannot start the server, you can access data by restoring the MySQL database from a valid backup (mysqldump) file. You can find the detailed steps on how to restore a MySQL database from mysqldump file, click here<\/a>.<\/p> If you don’t have a backup or it fails to work for you, the only solution is to use a MySQL database repair tool. Stellar Repair for MySQL helps repair severely corrupted InnoDB tables and recover their components.<\/p>\/usr\/local\/var<\/code><\/p>Solutions for innodb_force_recovery Not Working<\/strong><\/h2>
Workaround 1: Controlled InnoDB Force Recovery<\/strong><\/h3>
\n
innodb_force_recovery=3<\/code><\/p>innodb_purge_threads=0<\/code><\/p>\n
mysql> #mysqld_safe --innodb_force_recovery=4<\/code><\/p>Workaround 2: Restore MySQL from Backup<\/strong><\/h3>
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