Hi , i am running into trouble due to wrong index chosen by mysql in some
particular type of queries . This is happening in a critical production
environment where we have deployment in two different colocations . I am
seeing that a paticular query is using one index in one set of hosts &
another index in another set of hosts . We are not using 'use index' clause
to explicitly mention the index due to some limitations . But wondering
based on what mysql is using different indexes in different hosts . This is
really surprising , since dataset & table structures are exactly same in all
the hosts .
Other than changing the code to force using 'use index' , is there any other
way to resolve it ? And what's the exact reason behind this ? Just to have
mysql choose the correct index always will simply solve my problem .