Mysql innodb buffer pool buffer pool hit rate and which tables are hit? ——The road to dream building

Environmental Statement

mysql 5.7 and above

official

# InnoDB缓冲区缓存的命中率计算公式

100 * (1 - (innodb_buffer_pool_reads/innodb_buffer_pool_read_requests ))

注意: 对于具有大型缓冲池的系统，既要关注该比率，也要关注OS页面读写速率的变化可以更好地跟踪差异。

select * from performance_schema.global_status where VARIABLE_NAME in ('innodb_buffer_pool_reads', 'innodb_buffer_pool_read_requests');

Find out which InnoDB tables are cached in innodb buffer pool

You can discover how many pages of a table are cached in the buffer pool (sys mode) using sys mode (starting with MySQL Server 5.7, it is installed by default). The query to use is: SELECT * FROM sys.innodb_buffer_stats_by_table; 

Logical I/O is many times faster than physical I/O