8.5.3. Optimizing InnoDB Logging

Make your log files big, even as big as the buffer pool. When InnoDB has written the log files full, it must write the modified contents of the buffer pool to disk in a checkpoint. Small log files cause many unnecessary disk writes. Although historically big log files caused lengthy recovery times, recovery is now much faster and you can confidently use large log files.

Make the log buffer quite large as well (on the order of 8MB).