How can i optimize MySQL's ORDER BY RAND() function?

Question

I\'d like to optimize my queries so I look into mysql-slow.log.

Most of my slow queries contains ORDER BY RAND(). I cannot find a real solu

Answer 1

function getRandomRow(){
    $id = rand(0,NUM_OF_ROWS_OR_CLOSE_TO_IT);
    $res = getRowById($id);
    if(!empty($res))
    return $res;
    return getRandomRow();
}

//rowid is a key on table
function getRowById($rowid=false){

   return db select from table where rowid = $rowid; 
}