Optimize MySQL database query

Posted by rajeeesh on Stack Overflow See other posts from Stack Overflow or by rajeeesh
Published on 2012-03-28T05:17:12Z Indexed on 2012/03/28 5:30 UTC
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mysql

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mysql-management

I had a commenting application in my web site. The comments will store in a MySQL table . table structure as follows

id   |  Comment    |  user   |   created_date
------------------------------------------------------
12   |  comment he |  1245   |   2012-03-30 12:15:00
------------------------------------------------------

I need to run a query for listing all the comments after a specific time. ie .. a query like this

SELECT * FROM comments WHERE created_date > "2012-03-29 12:15:00" ORDER BY created_date DESC

Its working fine.. My question is if I got a 1-2 lakh entry in this table is this query is sufficient for the purpose ? or this query will take time to execute ? In most cases I have to show last 2 days data + periodically ( interval of 10 mins ) checking for updates with ajax from this table ...

Please help Thanks

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