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+2 votes
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I could count all questions with:

SELECT COUNT(*) FROM qa_posts WHERE type="Q"

or I could use the written value from the database (cached):

qa_opt('cache_qcount')

 

What is the speed difference? Is it really that immense?

1 Answer

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Although the field 'type' is indexed, it is still a db query, and depending on the size of your posts table, it takes time.  You can use phpmyadmin to see exactly how much time it takes - noting that if you use this query multiple times, the results get cached in mysql.

What is the reason not use cache_qcount?
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