Optimize MySQL database query

StackOverflow https://stackoverflow.com/questions/9901546

  •  27-05-2021
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Question

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
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12   |  comment he |  1245   |   2012-03-30 12:15:00
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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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Solution

Place index in created_date field. It will boost performance a lot...

Links: MySQL: http://dev.mysql.com/doc/refman/5.0/en/create-index.html
Using SQLyog: http://www.weberdev.com/ViewArticle/Managing-Foreign-Key-Relationships-In-MySQL-Using-SQLyog
WIKI: http://wiki.phpmyadmin.net/pma/primary_key

OTHER TIPS

You should add an index on "created_date" if not yet. more over you can use "explain" to optimize your query. here is some easy ways to optimize queries.

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