The most effective and reliable solutions would be implementing regular MySQL backups, including full backup and log backup.

Solution 3: Restart MySQL using backups (most useful)Īs is mentioned above, the server failed to start issues can be caused by different issues, and they might not work for you if unlucky. After completion, remove innodb_force_recovery or set it to 0, then recreate the database and import the data.īear in mind that this feature can only be used in an emergency situation, and a valuer greater than 3 (which means 4-6) might cause permanent damage to the data files, so it’s highly recommended to test it in the test environment first. Then restart MySQL, and export the data with mysqldump. If the issue is caused by the corruption of table space, and the roll-forward recovery fails when restarting, you need to add the following command in /etc/mysql/my.cnf: For the usage of different value settings please refer to MySQL official documentation for more. To enable innodb_force_recovery, you need to set the value of the parameter greater than 0, which can be from 1-6. When serious corruption causes SELECT * FROM tbl_name statements/InnoDB background operations to unexpectedly exit or assert, or even cause InnoDB roll-forward recovery to crash, you can use innodb_force_recovery feature to start the InnoDB storage engine. Solution 2: Forcing InnoDB Recovery (for emergency situation only) Now, you can check the running status of the MySQL server again, it will be in active (running) status if succeed. Step 3: Delete all files in /var/lib/mysql Step 2: Grant permissions first to prevent the issue is caused by lack of access permission. Solution 1: Delete files in /var/lib/mysql However, sometimes there might be a database server crash due to unexpected errors and unable to start. It can be installed on both Windows and Linux distributions, including CentOS, Debian, Oracle, Ubuntu, and more.

MySQL is a very popular open-source database management system that can be used by many database-driven web applications. Solution 3: Restart MySQL using backups (most useful).Solution 2: Forcing InnoDB Recovery (for emergency situation only).Solution 1: Delete files in /var/lib/mysql.

Mysql restart server