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mysql simple ORDER BY optimization

Posted on 2008-10-31
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Last Modified: 2012-05-05
I have a very simple SQL:

select * from members
ORDER BY online,photo DESC
LIMIT 0,12
This takes 4 seconds.

and this other sql :
select * from members
ORDER BY online DESC
LIMIT 0,12
takes less than 1 second

I had a look at
http://dev.mysql.com/doc/refman/5.0/en/order-by-optimization.html
It seems that you cannot optilmize the sql on 2 keys
Is there another way to optimize this SQL ?
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Question by:yarek
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brad2575 earned 1500 total points
ID: 22851124
well ordering by 1 item is much easier/faster then having to order by 2.

To optimize it I would add an index on the fields you are ordering by, but if it is a text field (DESC) it may not be a good field to add an index to.
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