Calculate the hit rate and utilization rate of mysql buffer
MyISAM Key buffer hit rate:
(Key_reads * 100) / Key_read_requests)
Utilization of MyISAM Key buffer:
(Key_blocks_unused * key_cache_block_size) * 100 / key_buffer_size)
The hit rate of InnoDB Buffer Pool
(Innodb_buffer_pool_read_requests-Innodb_buffer_pool_reads) / Innodb_buffer_pool_read_requests * 100% [@ more@]
