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POWhy it takes more time for MySQL to get records starting with higher number?
 

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    <blockquote> <p><strong>Possible Duplicate:</strong><br> <a href="https://stackoverflow.com/questions/1243952/how-can-i-speed-up-a-mysql-query-with-a-large-offset-in-the-limit-clause">How can I speed up a MySQL query with a large offset in the LIMIT clause?</a> </p> </blockquote> <p>In our application we are showing records from MySQL on a web page. Like in most such applications we use paging. So the query looks like this: </p> <pre><code>select * from sms_message where account_group_name = 'scott' and received_on &gt; '2012-10-11' and received_on &lt; '2012-11-30' order by received_on desc limit 200 offset 3000000; </code></pre> <p>This query takes 104 seconds. If I only change offset to low one or remove it completely, it's only half a second. Why is that?</p> <p>There is only one compound index, and it's account_group_name, received_on and two other columns. Table is InnoDB.</p> <p>UPDATE:</p> <p>Explain returns:</p> <pre><code>1 SIMPLE sms_message ref all_filters_index all_filters_index 258 const 2190030 Using where </code></pre> <p>all_filters_index is 4-columns filter mentioned above.</p>
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    1. USamorfis
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    1. COI think it's because of the fact that somewhere down the road engine needs to count first 3000000 before populating next 100 results.
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      1. USVardan Gupta
    2. COWhat's does `EXPLAIN` return?
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      1. USMike Brant
    3. CO@MikeBrant I updated the question and attached explain output.
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