我在寻找一种快速加入表格的方法时遇到问题,如下所示:
mysql> explain geo_ip;
+--------------+------------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+--------------+------------------+------+-----+---------+-------+
| ip_start | varchar(32) | NO | | "" | |
| ip_end | varchar(32) | NO | | "" | |
| ip_num_start | int(64) unsigned | NO | PRI | 0 | |
| ip_num_end | int(64) unsigned | NO | | 0 | |
| country_code | varchar(3) | NO | | "" | |
| country_name | varchar(64) | NO | | "" | |
| ip_poly | geometry | NO | MUL | NULL | |
+--------------+------------------+------+-----+---------+-------+
mysql> explain entity_ip;
+------------+---------------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+------------+---------------------+------+-----+---------+-------+
| entity_id | int(64) unsigned | NO | PRI | NULL | |
| ip_1 | tinyint(3) unsigned | NO | | NULL | |
| ip_2 | tinyint(3) unsigned | NO | | NULL | |
| ip_3 | tinyint(3) unsigned | NO | | NULL | |
| ip_4 | tinyint(3) unsigned | NO | | NULL | |
| ip_num | int(64) unsigned | NO | | 0 | |
| ip_poly | geometry | NO | MUL | NULL | |
+------------+---------------------+------+-----+---------+-------+
请注意,我对geo_ip
一次仅通过一个 IP 地址查找所需的行不感兴趣,我需要一种entity_ip LEFT JOIN geo_ip
(或类似/类似的方式)。
这就是我现在所拥有的(按照http://jcole.us/blog/archives/2007/11/24/on-efficiently-geo-referencing-ips-with-maxmind-geoip-and-mysql上的建议使用多边形-gis/ ):
mysql> EXPLAIN SELECT li.*, gi.country_code FROM entity_ip AS li
-> LEFT JOIN geo_ip AS gi ON
-> MBRCONTAINS(gi.`ip_poly`, li.`ip_poly`);
+----+-------------+-------+------+---------------+------+---------+------+--------+-------+
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |
+----+-------------+-------+------+---------------+------+---------+------+--------+-------+
| 1 | SIMPLE | li | ALL | NULL | NULL | NULL | NULL | 2470 | |
| 1 | SIMPLE | gi | ALL | ip_poly_index | NULL | NULL | NULL | 155183 | |
+----+-------------+-------+------+---------------+------+---------+------+--------+-------+
mysql> SELECT li.*, gi.country_code FROM entity AS li LEFT JOIN geo_ip AS gi ON MBRCONTAINS(gi.`ip_poly`, li.`ip_poly`) limit 0, 20;
20 rows in set (2.22 sec)
没有多边形
mysql> explain SELECT li.*, gi.country_code FROM entity_ip AS li LEFT JOIN geo_ip AS gi ON li.`ip_num` >= gi.`ip_num_start` AND li.`ip_num` <= gi.`ip_num_end` LIMIT 0,20;
+----+-------------+-------+------+---------------------------+------+---------+------+--------+-------+
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |
+----+-------------+-------+------+---------------------------+------+---------+------+--------+-------+
| 1 | SIMPLE | li | ALL | NULL | NULL | NULL | NULL | 2470 | |
| 1 | SIMPLE | gi | ALL | PRIMARY,geo_ip,geo_ip_end | NULL | NULL | NULL | 155183 | |
+----+-------------+-------+------+---------------------------+------+---------+------+--------+-------+
mysql> SELECT li.*, gi.country_code FROM entity_ip AS li LEFT JOIN geo_ip AS gi ON li.ip_num BETWEEN gi.ip_num_start AND gi.ip_num_end limit 0, 20;
20 rows in set (2.00 sec)
(在搜索中的行数更多 - 没有区别)
目前我无法从这些查询中获得更快的性能,因为每个 IP 0.1 秒对我来说太慢了。
有没有办法让它更快?