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I'm sorry, my English is not good to say, send a picture to the program authors look at, hope you can understand I want to express the meaning of this system is very good, but do not know how much he can carry the largest data

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Can you please post the output of:

EXPLAIN SELECT COUNT(DISTINCT (userid) ) FROM qa_posts;

Also, what is the running time of:

SELECT COUNT(DISTINCT (userid) ) FROM qa_posts;

Thanks!
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I replaced a host, I found that he can continue to work, but do not know why the original host can not work. The same configuration.

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