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Why is InnoDB disabled?

After I reconfigured the my.cnf file InnoDB was disabled. Why?

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Hello Oli,

this can have several different reasons.

The most common one happens with MySQL 5.5 and older when the InnoDB log file size (innodb_log_file_size) was set to an new value which is not compatible with the old value. To avoid this problem shut-down MySQL properly (mysqladmin --user=root shutdown). Then backup and after remove the logfiles, configure the my.cnf with the new log file size. Start MySQL again and check the error.log.