Description:

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Export three status variables: logical_read, phsical_read and physical_async_read for buffer pool hit read,

buffer pool miss sync read, and buffer pool miss async read respectively

Export session variable rds_sql_max_iops to control the IO usage for single sql statement

ex:

set session rds_sql_max_iops=100;

When sql execution returning from innodb to server layer, it will check whether IOPS is oversubscribed,

if so it might sleep some delta time to prevent from overkilling I/O bandwith for single sql statement