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Please help :)
Posted by: Heather Walker
Date: April 18, 2005 04:18PM

I'm hoping someone can help me figure out what is wrong here. Here is the deal. I have a new IP-country database list that I put into a myisiam table. The problem is queries to locate a country using this table is taking MUCH longer than our current IP-country table, and I cannot figure out why. Using explain shows that MYSQL isn't using any keys when executing the query.

Here is the database structure:

CREATE TABLE `ipcountryNEW` (
`ipFROM` int(10) unsigned zerofill NOT NULL default '0000000000',
`ipTO` int(10) unsigned zerofill NOT NULL default '0000000000',
`countrySHORT` char(2) NOT NULL default '',
`countryLONG` varchar(255) NOT NULL default '',
`Region` varchar(128) NOT NULL default '',
`City` varchar(128) NOT NULL default '',
PRIMARY KEY (`ipFROM`,`ipTO`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1
*************************************************************
Here is an example query:
mysql> select countryLONG from ipcountryNEW where 1142156934 between ipFROM AND ipTO;
+---------------+
| countryLONG |
+---------------+
| UNITED STATES |
+---------------+
1 row in set (4.04 sec)
*************************************************************
mysql> select count(*) from ipcountryNEW;
+----------+
| count(*) |
+----------+
| 1554025 |
+----------+
1 row in set (0.09 sec)
*************************************************************
--Even if I try a little different query, I still don't get the engine to use the key...

mysql> EXPLAIN select countryLONG from ipcountryNEW where ipFROM>=1142156934 AND ipTO<=1142156934;
+----+-------------+--------------+------+---------------+------+---------+------+---------+-------------+
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |
+----+-------------+--------------+------+---------------+------+---------+------+---------+-------------+
| 1 | SIMPLE | ipcountryNEW | ALL | PRIMARY | NULL | NULL | NULL | 1554025 | Using where |
+----+-------------+--------------+------+---------------+------+---------+------+---------+-------------+
1 row in set (0.09 sec)
*************************************************************
mysql> explain select countryLONG from ipcountryNEW where 1142156934 between ipFROM AND ipTO;
+----+-------------+--------------+------+---------------+------+---------+------+---------+-------------+
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |
+----+-------------+--------------+------+---------------+------+---------+------+---------+-------------+
| 1 | SIMPLE | ipcountryNEW | ALL | NULL | NULL | NULL | NULL | 1554025 | Using where |
+----+-------------+--------------+------+---------------+------+---------+------+---------+-------------+
1 row in set (0.24 sec)
*************************************************************

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Please help :)
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April 18, 2005 04:18PM
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