The size of each log file in a log group. The default is 5MB. The larger the value, the less checkpoint flush activity is needed in the buffer pool, saving disk I/O. But large log files also mean that recovery will be slower in case of a crash.
根据MySQL手册，推荐值是innodb_buffer_pool_size的25%。
注意：在重新设置该值时，好像要把原来的文件删除掉。
innodb_log_buffer_size
The size of the buffer that InnoDB uses to write to the log files on disk. Sensible values range from 1MB to 8MB. The default is 1MB. A large log buffer allows large transactions to run without a need to write the log to disk before the transactions commit. Thus, if you have big transactions, making the log buffer larger will save disk I/O.
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