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Re: MySQL is eating all the CPU 100% - Guide me to fix this please
Posted by: Mahesh Kumar
Date: October 23, 2017 06:17AM

Sir,

If i change the db to innodb engine, can i get any improvement in performance?
I am thinking to move the site to new server leaving mysql server in my current server. Is that a good idea?

SELECT * FROM question.*, user_question_answer.*, GROUP_CONCAT(choices.id) as choice_id_array, GROUP_CONCAT(choices.choice) as choice_array, GROUP_CONCAT(choices.points) as points_array, GROUP_CONCAT(choices.result_id) as result_array

This is the select part, and then i do inner join of user_question_answer with these conditions 'questions.id = user_question_answer.user_question_id' another inner join with choices table 'questions.id = choices.question_id'

Where condition is
'user_id' = some id and quiz id = some id
Group by 'questions.id, user_question_answer.id'
Question id is used in user_question_answer and choices tables.

I am not able to get the complete query from this framework. But this is one of the query which uses more joins.

Will i get any performance improvement if i use single table which can hold all the questions, choices, results in json format?

Thanks for helping

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November 07, 2017 09:51AM
Re: MySQL is eating all the CPU 100% - Guide me to fix this please
October 23, 2017 06:17AM


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