GeoIP table join with table of IP's in MySQL

Question

I am having a issue finding a fast way of joining the tables looking like that:

mysql> explain geo_ip;
+--------------+------------------+------+-----+---         


        

Answer 1

I found a easy way. I noticed that all first ip in the group % 256 = 0, so we can add a ip_index table

CREATE TABLE `t_map_geo_range` (
  `_ip` int(10) unsigned NOT NULL,
  `_ipStart` int(10) unsigned NOT NULL,
  PRIMARY KEY (`_ip`)
) ENGINE=MyISAM

How to fill the index table

FOR_EACH(Every row of ip_geo)
{
    FOR(Every ip FROM ipGroupStart/256 to ipGroupEnd/256)
    {
        INSERT INTO ip_geo_index(ip, ipGroupStart);
    }
}

How to use:

SELECT * FROM YOUR_TABLE AS A
LEFT JOIN ip_geo_index AS B ON B._ip = A._ip DIV 256
LEFT JOIN ip_geo AS C ON C.ipStart = B.ipStart;

More than 1000 times Faster.