From: Peter Brawley
Date: April 26 2005 7:21pm
Subject: Re: Get a Random Row on a HUGE db
List-Archive: http://lists.mysql.com/mysql/183194
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Gunmuse,

SELECT from firebase_content LAST_INSERT_ID()

In that cmd, 'from ...' ain't right.

I didn't understand either what's wrong with ORDER BY RAND() LIMIT 1.

Also check the Perl manual for how to retrieve a single value.

PB

-----

gunmuse@stripped wrote:

>Thanks for that I implemented to my Random code.  Same problem that select *
>portion is just a nightmare.  Remember I selecting 38mb of data when I do
>that.
>
>What I want to do is jump to a Valid random row.  Now If I didn't delete
>content often that would be easy grab the last autoincremented row_id and
>get a random number between 1 and End  Jump to that row to create the link.
>Very fast. Zero load
>
>So what I am trying is this.
>
>$last_row ="SELECT from firebase_content LAST_INSERT_ID()";
>$last_row_query = $dbi->query($last_row);
>$last_row_result = $row->id;
>
>But what I am seeing is this:
>
>Object id #9
>
>and not the number that is in the database.
>
>What am I sending to this variable that is wrong?
>
>
>
>[snip]
>I am wanting to display a random page from my site, But I have over
>12,000 articles right now and we add over 150 per day.  What I wound up
>doing was a Virtual DOS attack on my own server because the 40 mb db was
>being loaded to many times.
>
>I have tons of memory and a Dell Dual Xeon 2.8 gig.
>
>Can someone think up a better way of doing this?  I wish Mysql would
>just bring me back 1 valid random row  It could be used in so many ways
>it should just be a part of MySql anyway.
>
><?php
>ini_set("display_errors", '1');
>header("Pragma: private");
>header("Cache-Control: post-check=0, pre-check=0", false);
>header("Cache-Control: no-cache, must-revalidate");
>require_once("firebase.conf.php");
>$dbi = new DBI(DB_URL);
>$stmt = "Select * from firebase_content ORDER BY RAND(NOW()) LIMIT 1";
>$result = $dbi->query($stmt);
>while($row = $result->fetchRow())
>{
> $title = $row->title;
> $cate = $row->category;
> $get = "Select cat_url from firebase_categories where
>cat_name='$cate'";
> $now = $dbi->query($get);
> $rows = $now->fetchRow();
> $url = $rows->cat_url;
> $link = $url . $title;
>}
>header("Location: http://www.prnewsnow.com/$link");
>exit;
>/* Sudo code that I am trying to create to relieve server stress.
>function randomRow(table, column) {
>var maxRow = query("SELECT MAX($column) AS maxID FROM $table");
>var randomID;
>var randomRow;
>do {
>randomID = randRange(1, maxRow.maxID);
>randomRow = query("SELECT * FROM $table WHERE $column = $randomID");
>} while (randomRow.recordCount == 0); return randomRow;
>}
>*/
>?>
>[/snip]
>
>Try this ...
>SELECT * FROM foo ORDER BY RAND(NOW()) LIMIT 1;
>
>12000 rows is not huge at all, so this should be pretty quick
>
>--
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>
>
>
>
>  
>


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